A 5-month-old male infant is brought to the physician by his mother because of a generalized pruritic rash for 2-weeks. The itchiness often causes the infant to wake up at night. He was strictly breastfed until 4 months of age, when he was transitioned to formula feeding. His father has a history of asthma. His immunizations are up-to-date. He is at the 75th percentile for length and the 70th percentile for weight. Examination shows dry and scaly patches on the face and extensor surfaces of the extremities. The groin is spared. Which of the following is the most appropriate next step in management?
Q132
A 1-month-old female presents with her parents to the pediatrician for a well visit. Her mother reports that the patient has been exclusively breastfed since birth. The patient feeds for 30 minutes 6-7 times per day, urinates 8-10 times per day, and passes 4-5 loose, “seedy” yellow stools per day. The patient sleeps for about ten hours at night and takes 3-4 naps of 2-3 hours duration each. Her mother is concerned that the patient cries significantly more than her two older children. She reports that the patient cries for about 20-30 minutes up to four times per day, usually just before feeds. The crying also seems to be worse in the early evening, and the patient’s mother reports that it is difficult to console the patient. The patient’s parents have tried swaddling the patient and rocking her in their arms, but she only seems to calm down when in the infant swing. The patient’s height and weight are in the 60th and 70th percentiles, respectively, which is consistent with her growth curves. Her temperature is 97.4°F (36.3°C), blood pressure is 74/52 mmHg, pulse is 138/min, and respirations are 24/min. On physical exam, the patient appears comfortable in her mother’s arms. Her anterior fontanelle is soft and flat, and her eye and ear exams are unremarkable. Her abdomen is soft, non-tender, and non-distended. She is able to track to the midline.
This patient is most likely to have which of the following conditions?
Q133
A 3-year-old boy presents to the office with his mother. She states that her son seems weak and unwilling to walk. He only learned how to walk recently after a very notable delay. The boy was born at 39 weeks gestation via spontaneous vaginal delivery. He is up to date on all vaccines and is meeting all verbal and social milestones but he has a great deal of trouble with gross and fine motor skills. Past medical history is noncontributory. He takes a multivitamin every day. The mother states that some boys on her side of the family have had similar symptoms and worries that her son might have the same condition. Today, the boy’s vital signs include: blood pressure 110/65 mm Hg, heart rate 90/min, respiratory rate 22/min, and temperature 37.0°C (98.6°F). On physical exam, the boy appears well developed and pleasant. He sits and listens and follows direction. His heart has a regular rate and rhythm and his lungs are clear to auscultation bilaterally. He struggles to get up to a standing position after sitting on the floor. A genetic study is performed that reveals a significant deletion in the gene that codes for dystrophin. Which of the following is the most likely diagnosis?
Q134
A 6-year-old girl is brought to the physician by her parents because of concern that she is the shortest in her class. She has always been short for her age, but she is upset now that her classmates have begun teasing her for her height. She has no history of serious illness and takes no medications. She is 109 cm (3 ft 7 in) tall (10th percentile) and weighs 20 kg (45 lb) (50th percentile). Her blood pressure is 140/80 mm Hg. Vital signs are otherwise within normal limits. Physical examination shows a low-set hairline and a high-arched palate. Breast development is Tanner stage 1 and the nipples are widely spaced. Extremities are well perfused with strong peripheral pulses. Her hands are moderately edematous. This patient is at increased risk of developing which of the following complications?
Q135
An 8-year-old boy is brought to the physician by his parents because of repeated episodes of “daydreaming.” The mother reports that during these episodes the boy interrupts his current activity and just “stares into space.” She says that he sometimes also smacks his lips. The episodes typically last 1–2 minutes. Over the past 2 months, they have occurred 2–3 times per week. The episodes initially only occurred at school, but last week the patient had one while he was playing baseball with his father. When his father tried to talk to him, he did not seem to listen. After the episode, he was confused for 10 minutes and too tired to play. The patient has been healthy except for an episode of otitis media 1 year ago that was treated with amoxicillin. Vital signs are within normal limits. Physical and neurological examinations show no other abnormalities. Further evaluation of this patient is most likely to show which of the following findings?
Q136
A 7-year-old boy is brought to the physician because his parents are concerned about his early sexual development. He has no history of serious illness and takes no medications. His brother was diagnosed with testicular cancer 5 years ago and underwent a radical orchiectomy. The patient is at the 85th percentile for height and 70th percentile for weight. Examination shows greasy facial skin. There is coarse axillary hair. Pubic hair development is at Tanner stage 3 and testicular development is at Tanner stage 2. The remainder of the examination shows no abnormalities. An x-ray of the wrist shows a bone age of 10 years. Basal serum luteinizing hormone and follicle-stimulating hormone are elevated. An MRI of the brain shows no abnormalities. Which of the following is the most appropriate next step in management?
Q137
A 31-year-old woman gives birth to a boy in the labor and delivery ward of the local hospital. The child is immediately assessed and found to be crying vigorously. He is pink in appearance with blue extremities that appear to be flexed. Inducing some discomfort shows that both his arms and legs move slightly but remain largely flexed throughout. His pulse is found to be 128 beats per minute. What is the most likely APGAR score for this newborn at this time?
Q138
A 5-year-old boy is brought to the physician because of early morning headaches for the past 6 months. During this period, he has had severe nausea and occasional episodes of vomiting. For the past month, he has had difficulty walking and intermittent double vision. He was born at term and has been healthy apart from an episode of sinusitis 8 months ago that resolved spontaneously. He is at the 60th percentile for height and 50th percentile for weight. His temperature is 37.1°C (98.8°F), pulse is 80/min, and blood pressure is 105/64 mm Hg. Examination shows normal muscle strength and 2+ deep tendon reflexes bilaterally. He has a broad-based gait and impaired tandem gait. Fundoscopy shows bilateral swelling of the optic disc. There is esotropia of the left eye. Which of the following is the most likely diagnosis?
Q139
A 15-year-old boy is brought to the physician for a well-child visit. His parents are concerned that he has not had his growth spurt yet. As a child, he was consistently in the 60th percentile for height; now he is in the 25th percentile. His classmates make fun of his height and high-pitched voice. His parents are also concerned that he does not maintain good hygiene. He frequently forgets to shower and does not seem aware of his body odor. As an infant, he had bilateral orchidopexy for cryptorchidism and a cleft palate repair. He is otherwise healthy. Vital signs are within normal limits. On physical exam, axillary and pubic hair is sparse. Genitals are Tanner stage 1 and the testicles are 2 mL bilaterally. Which of the following is the most likely diagnosis?
Q140
A 6-month-old boy is brought to the emergency department by his mother, who informs the doctor that her alcoholic husband hit the boy hard on his back. The blow was followed by excessive crying for several minutes and the development of redness in the area. On physical examination, the boy is dehydrated, dirty, and irritable and when the vital signs are checked, they reveal tachycardia. He cries immediately upon the physician touching the area around his left scapula. The doctor strongly suspects a fracture of the 6th, 7th, or 8th retroscapular posterior ribs. Evaluation of his skeletal survey is normal. The clinician is concerned about child abuse in this case. Which of the following is the most preferred imaging technique as the next step in the diagnostic evaluation of the infant?
Growth/Development US Medical PG Practice Questions and MCQs
Question 131: A 5-month-old male infant is brought to the physician by his mother because of a generalized pruritic rash for 2-weeks. The itchiness often causes the infant to wake up at night. He was strictly breastfed until 4 months of age, when he was transitioned to formula feeding. His father has a history of asthma. His immunizations are up-to-date. He is at the 75th percentile for length and the 70th percentile for weight. Examination shows dry and scaly patches on the face and extensor surfaces of the extremities. The groin is spared. Which of the following is the most appropriate next step in management?
A. Topical emollient (Correct Answer)
B. Oral acyclovir
C. Oral vitamin A
D. Tar-containing shampoo
E. Topical coal tar
Explanation: ***Topical emollient***
- The infant presents with symptoms highly suggestive of **atopic dermatitis** (**eczema**), including a pruritic rash, characteristic distribution (face and extensor surfaces), dry scaly patches, and a family history of atopy (father with **asthma**).
- **Emollients** are crucial for restoring the skin barrier, reducing dryness, and alleviating pruritus, serving as the first-line and foundational treatment for atopic dermatitis.
*Oral acyclovir*
- **Acyclovir** is an antiviral medication used to treat herpes simplex virus infections, such as **eczema herpeticum**.
- There is no indication of a viral infection (e.g., vesicles, fever, signs of disseminated infection) in this case to warrant antiviral therapy.
*Oral vitamin A*
- **Vitamin A** deficiency can cause dry skin and hyperkeratosis, but it is not the primary cause of widespread eczematous rash in a well-nourished infant.
- There is no evidence suggesting **vitamin A deficiency** in this patient, and supplementation is not a treatment for atopic dermatitis.
*Tar-containing shampoo*
- **Tar-containing shampoos** are primarily used for scalp conditions like **seborrheic dermatitis** or **psoriasis**, to help reduce scaling and inflammation.
- The rash is generalized on the face and extensor surfaces, not limited to the scalp, and the infant's condition is more consistent with atopic dermatitis than these other conditions.
*Topical coal tar*
- **Topical coal tar** preparations are sometimes used in chronic, lichenified atopic dermatitis or psoriasis due to their anti-inflammatory and antiproliferative effects.
- However, they can be irritating, stain clothing, and are generally not the first-line treatment for a 5-month-old infant with widespread acute eczema; emollients and often topical corticosteroids are preferred initially.
Question 132: A 1-month-old female presents with her parents to the pediatrician for a well visit. Her mother reports that the patient has been exclusively breastfed since birth. The patient feeds for 30 minutes 6-7 times per day, urinates 8-10 times per day, and passes 4-5 loose, “seedy” yellow stools per day. The patient sleeps for about ten hours at night and takes 3-4 naps of 2-3 hours duration each. Her mother is concerned that the patient cries significantly more than her two older children. She reports that the patient cries for about 20-30 minutes up to four times per day, usually just before feeds. The crying also seems to be worse in the early evening, and the patient’s mother reports that it is difficult to console the patient. The patient’s parents have tried swaddling the patient and rocking her in their arms, but she only seems to calm down when in the infant swing. The patient’s height and weight are in the 60th and 70th percentiles, respectively, which is consistent with her growth curves. Her temperature is 97.4°F (36.3°C), blood pressure is 74/52 mmHg, pulse is 138/min, and respirations are 24/min. On physical exam, the patient appears comfortable in her mother’s arms. Her anterior fontanelle is soft and flat, and her eye and ear exams are unremarkable. Her abdomen is soft, non-tender, and non-distended. She is able to track to the midline.
This patient is most likely to have which of the following conditions?
A. Milk protein allergy
B. Constipation
C. Gastroesophageal reflux disease
D. Infantile colic (Correct Answer)
E. Normal infant crying
Explanation: ***Infantile colic***
- This infant meets the clinical criteria for infantile colic with **paroxysmal crying episodes** (20-30 minutes, up to 4 times daily = 80-120 minutes/day) that are **difficult to console** and have a characteristic **evening predominance**.
- Key diagnostic features present: occurs in an otherwise **healthy, thriving infant** (normal growth, feeding, and physical exam), crying is **difficult to console** (only calms in infant swing), and episodes **cluster in the early evening** - all hallmark features of colic.
- While the strict Wessel criteria specify "at least 3 hours per day," the **Rome IV criteria** emphasize the paroxysmal, inconsolable nature and characteristic timing pattern, which this infant clearly demonstrates.
- Colic typically begins around **2-3 weeks of age**, peaks at **6 weeks**, and resolves by **3-4 months** in most infants.
*Normal infant crying*
- Normal infant crying is typically **easily consolable** with routine soothing measures (feeding, diaper change, holding).
- This infant's crying is **difficult to console** (parents tried multiple methods, only responds to infant swing) and has the characteristic **evening clustering** seen in colic, not normal crying patterns.
- The paroxysmal nature and predictable timing (before feeds, early evening) suggest a pathological pattern beyond normal crying.
*Milk protein allergy*
- Would typically present with **bloody or mucousy stools**, eczema, vomiting, or poor weight gain.
- This infant has normal **seedy yellow stools** (typical for breastfed babies), excellent weight gain (70th percentile), and no skin or GI manifestations of allergy.
*Constipation*
- Characterized by **infrequent, hard stools** (less than once per day in exclusively breastfed infants).
- This infant passes **4-5 loose, seedy yellow stools per day**, which is completely normal for an exclusively breastfed 1-month-old.
*Gastroesophageal reflux disease*
- Would typically present with **frequent spitting up or vomiting**, irritability during/after feeds, arching, or poor weight gain.
- This infant has **no reported vomiting**, feeds well for 30 minutes at each session, and has **excellent weight gain** (70th percentile), making GERD unlikely.
Question 133: A 3-year-old boy presents to the office with his mother. She states that her son seems weak and unwilling to walk. He only learned how to walk recently after a very notable delay. The boy was born at 39 weeks gestation via spontaneous vaginal delivery. He is up to date on all vaccines and is meeting all verbal and social milestones but he has a great deal of trouble with gross and fine motor skills. Past medical history is noncontributory. He takes a multivitamin every day. The mother states that some boys on her side of the family have had similar symptoms and worries that her son might have the same condition. Today, the boy’s vital signs include: blood pressure 110/65 mm Hg, heart rate 90/min, respiratory rate 22/min, and temperature 37.0°C (98.6°F). On physical exam, the boy appears well developed and pleasant. He sits and listens and follows direction. His heart has a regular rate and rhythm and his lungs are clear to auscultation bilaterally. He struggles to get up to a standing position after sitting on the floor. A genetic study is performed that reveals a significant deletion in the gene that codes for dystrophin. Which of the following is the most likely diagnosis?
A. Limb-girdle muscular dystrophy
B. Becker muscular dystrophy
C. Myotonic muscular dystrophy
D. Emery-Dreifuss muscular dystrophy
E. Duchenne muscular dystrophy (Correct Answer)
Explanation: ***Duchenne muscular dystrophy***
- The patient's presentation with **delayed walking**, **progressive muscle weakness** (manifesting as difficulty getting up from the floor, i.e., **Gowers' sign**), and the genetic finding of a **significant dystrophin gene deletion** are classic for Duchenne muscular dystrophy (DMD).
- DMD is caused by **out-of-frame deletions** or mutations that result in the **complete absence of functional dystrophin protein**, leading to severe, early-onset muscle weakness.
- DMD is an **X-linked recessive** condition, explaining the maternal family history of similar symptoms in boys, as only males are typically affected.
*Limb-girdle muscular dystrophy*
- This group of disorders also causes progressive muscle weakness, primarily affecting the **proximal muscles** of the shoulders and hips.
- However, these are caused by mutations in genes **other than dystrophin**, and the **specific dystrophin gene deletion** found in this patient points definitively to DMD rather than limb-girdle muscular dystrophy.
*Becker muscular dystrophy*
- Becker muscular dystrophy (BMD) is also caused by mutations in the **dystrophin gene**, but typically involves **in-frame deletions** that produce a **shortened but partially functional** dystrophin protein.
- The **significant deletion** described in this case, combined with the **severe, early-onset presentation** (weakness at age 3, delayed walking), indicates complete loss of dystrophin function characteristic of DMD, not the milder BMD which typically presents later (age 5-15) with slower progression.
*Myotonic muscular dystrophy*
- This condition is characterized by **myotonia** (delayed muscle relaxation) and a multisystemic presentation, often including **facial weakness**, **cataracts**, and cardiac conduction abnormalities.
- It is caused by a **trinucleotide repeat expansion**, not a dystrophin gene deletion, and none of the key features of myotonic dystrophy are described in this patient's presentation.
*Emery-Dreifuss muscular dystrophy*
- Emery-Dreifuss muscular dystrophy (EDMD) is characterized by a classic triad of **early contractures** (elbows, ankles, neck), **progressive muscle weakness** (especially in the humeroperoneal distribution), and **cardiac involvement** (e.g., conduction defects).
- While some forms of EDMD can involve genes related to the dystrophin-associated protein complex, the **dystrophin gene deletion** itself is specific to DMD/BMD, and this patient lacks the characteristic early contractures and cardiac findings of EDMD.
Question 134: A 6-year-old girl is brought to the physician by her parents because of concern that she is the shortest in her class. She has always been short for her age, but she is upset now that her classmates have begun teasing her for her height. She has no history of serious illness and takes no medications. She is 109 cm (3 ft 7 in) tall (10th percentile) and weighs 20 kg (45 lb) (50th percentile). Her blood pressure is 140/80 mm Hg. Vital signs are otherwise within normal limits. Physical examination shows a low-set hairline and a high-arched palate. Breast development is Tanner stage 1 and the nipples are widely spaced. Extremities are well perfused with strong peripheral pulses. Her hands are moderately edematous. This patient is at increased risk of developing which of the following complications?
A. Precocious puberty
B. Acute lymphoblastic leukemia
C. Ectopia lentis
D. Renal cell carcinoma
E. Aortic insufficiency (Correct Answer)
Explanation: ***Aortic insufficiency***
- The patient's features, including **short stature**, **low-set hairline**, **widely spaced nipples**, **high-arched palate**, and **hand edema**, are classic for **Turner syndrome (45,XO)**.
- Individuals with Turner syndrome are at significantly increased risk of **cardiovascular anomalies**, particularly **bicuspid aortic valve** and **coarctation of the aorta**, which can both lead to **aortic insufficiency** and hypertension.
*Precocious puberty*
- **Precocious puberty** involves the premature onset of puberty, which is not suggested by the patient's **Tanner stage 1 breast development**, indicating **absent breast development**.
- Girls with Turner syndrome typically experience **delayed or absent puberty** due to gonadal dysgenesis and **ovarian failure**.
*Acute lymphoblastic leukemia*
- While chromosomal abnormalities can increase cancer risk, there is no strong, direct association between **Turner syndrome** and an increased risk of **acute lymphoblastic leukemia (ALL)** specifically.
- The presenting symptoms do not point towards hematological malignancy, which would involve signs like **fatigue**, **bruising**, or **recurrent infections**.
*Ectopia lentis*
- **Ectopia lentis**, or displaced lens, is a hallmark feature of conditions like **Marfan syndrome** and **homocystinuria**, not typically associated with Turner syndrome.
- There are no other features of connective tissue disorders presented in the patient's clinical picture.
*Renal cell carcinoma*
- While individuals with Turner syndrome can have a higher incidence of **renal anomalies**, such as **horseshoe kidney** or **duplex collecting systems**, there is no specific increased risk of **renal cell carcinoma** directly linked to the syndrome.
- The high blood pressure in this patient is more attributable to **cardiovascular defects** like coarctation of the aorta.
Question 135: An 8-year-old boy is brought to the physician by his parents because of repeated episodes of “daydreaming.” The mother reports that during these episodes the boy interrupts his current activity and just “stares into space.” She says that he sometimes also smacks his lips. The episodes typically last 1–2 minutes. Over the past 2 months, they have occurred 2–3 times per week. The episodes initially only occurred at school, but last week the patient had one while he was playing baseball with his father. When his father tried to talk to him, he did not seem to listen. After the episode, he was confused for 10 minutes and too tired to play. The patient has been healthy except for an episode of otitis media 1 year ago that was treated with amoxicillin. Vital signs are within normal limits. Physical and neurological examinations show no other abnormalities. Further evaluation of this patient is most likely to show which of the following findings?
A. Temporal lobe spikes on EEG (Correct Answer)
B. Defiant behavior towards figures of authority
C. Conductive hearing loss on audiometry
D. Impairment in communication and social interaction
E. Normal neurodevelopment
Explanation: ***Temporal lobe spikes on EEG***
- The description of staring spells, lip smacking, post-ictal confusion, and the duration of 1-2 minutes are highly suggestive of **temporal lobe epilepsy**, specifically **focal seizures with impaired awareness**.
- **EEG** is the gold standard for diagnosing epilepsy and would likely show characteristic **epileptiform discharges** or spikes originating from the temporal lobe.
*Defiant behavior towards figures of authority*
- This symptom is suggestive of oppositional defiant disorder or conduct disorder, which are **behavioral disorders** and not typically associated with the described seizure activity.
- While a child with epilepsy might experience behavioral changes, isolated defiant behavior is not the primary expected finding for the described episodes.
*Conductive hearing loss on audiometry*
- Conductive hearing loss is a result of problems in the outer or middle ear and would be suggested by a history of **recurrent otitis media** or other ear pathology.
- Although the patient had otitis media previously, his current symptoms of "daydreaming" and lip smacking are neurological, not indicative of hearing impairment.
*Impairment in communication and social interaction*
- This constellation of symptoms, along with repetitive behaviors, is characteristic of **autism spectrum disorder**.
- The described episodes are acute, paroxysmal events with a distinct post-ictal phase, making a developmental disorder less likely to be the primary finding for these specific occurrences.
*Normal neurodevelopment*
- While the patient's past medical history is otherwise unremarkable, the presence of these "daydreaming" or staring spells with associated motor phenomena (lip smacking) and post-ictal confusion indicates an **abnormal neurological event** (seizure).
- Therefore, further evaluation would likely reveal an underlying neurological abnormality rather than completely normal neurodevelopment.
Question 136: A 7-year-old boy is brought to the physician because his parents are concerned about his early sexual development. He has no history of serious illness and takes no medications. His brother was diagnosed with testicular cancer 5 years ago and underwent a radical orchiectomy. The patient is at the 85th percentile for height and 70th percentile for weight. Examination shows greasy facial skin. There is coarse axillary hair. Pubic hair development is at Tanner stage 3 and testicular development is at Tanner stage 2. The remainder of the examination shows no abnormalities. An x-ray of the wrist shows a bone age of 10 years. Basal serum luteinizing hormone and follicle-stimulating hormone are elevated. An MRI of the brain shows no abnormalities. Which of the following is the most appropriate next step in management?
A. Leuprolide therapy (Correct Answer)
B. Testicular ultrasound
C. Cortisol supplementation
D. Radiation therapy
E. Observation
Explanation: ***Leuprolide therapy***
- This patient presents with **central precocious puberty** (CPP), indicated by elevated **basal LH and FSH levels** in the context of advanced bone age, Tanner stage 3 pubic hair, and Tanner stage 2 testicular development at a young age.
- **Leuprolide** is a GnRH analog that, when given continuously, downregulates the pituitary's GnRH receptors, suppressing gonadotropin release and halting pubertal progression. This is the appropriate treatment for CPP.
*Testicular ultrasound*
- While useful for evaluating testicular size and consistency, it is typically performed when there is suspicion of **peripheral precocious puberty** (e.g., Leydig cell tumor) with low LH/FSH or significant testicular asymmetry, which is not the primary presentation here.
- The elevated basal LH and FSH values indicate a **central origin** of puberty, making a testicular ultrasound less immediately relevant as a *next step* compared to directly addressing the central hormonal drive.
*Cortisol supplementation*
- This would be indicated for conditions causing **adrenal insufficiency**, such as **congenital adrenal hyperplasia (CAH)** with salt-wasting or Addison's disease.
- CAH typically presents with virilization and advanced bone age but would show **low LH/FSH** (due to peripheral androgen excess) and elevated adrenal androgens (e.g., DHEA-S, 17-hydroxyprogesterone), which are not described.
*Radiation therapy*
- This is a treatment for **malignant tumors**, often used in cases of brain tumors.
- The MRI of the brain showed **no abnormalities**, ruling out a pituitary or hypothalamic tumor as the cause of CPP in this case, thus making radiation therapy inappropriate.
*Observation*
- **Observation** alone is inappropriate given the significant **advancement of bone age** (10 years in a 7-year-old) and clear signs of central precocious puberty.
- Untreated CPP can lead to **compromised adult height potential** due to premature epiphyseal fusion and psychosocial issues, necessitating intervention.
Question 137: A 31-year-old woman gives birth to a boy in the labor and delivery ward of the local hospital. The child is immediately assessed and found to be crying vigorously. He is pink in appearance with blue extremities that appear to be flexed. Inducing some discomfort shows that both his arms and legs move slightly but remain largely flexed throughout. His pulse is found to be 128 beats per minute. What is the most likely APGAR score for this newborn at this time?
A. 8 (Correct Answer)
B. 5
C. 9
D. 6
E. 7
Explanation: ***8***
- The assessment breaks down as: **Appearance** (pink body with blue extremities/acrocyanosis) = 1 point; **Pulse** (128 bpm, >100) = 2 points; **Grimace** (crying vigorously in response to discomfort) = 2 points; **Activity** (slight movement but remains largely flexed) = 1 point; **Respiration** (crying vigorously) = 2 points. Total = **8**.
- An APGAR score of 8-10 is considered **normal** and indicates a healthy newborn with only minor deductions (in this case, acrocyanosis which is common and benign).
*7*
- A score of 7 would require one fewer point, such as only 1 point for **Respiration** (weak cry or slow breathing) instead of 2 points.
- The infant's **vigorous crying** clearly merits 2 points for respiration, not 1, making a score of 7 incorrect.
*9*
- A score of 9 would require either fully pink appearance (2 points for Appearance) or active movement against resistance (2 points for Activity).
- The infant's **acrocyanosis** (blue extremities) limits Appearance to 1 point, and **limited activity** (largely flexed with only slight movement) prevents a score of 9.
*5*
- A score of 5 suggests moderate distress with significantly lower scores across multiple categories.
- The infant's strong pulse (2 points), vigorous crying (2 points each for Grimace and Respiration), and reasonable activity contradict an APGAR score of 5.
*6*
- A score of 6 would imply lower scores in at least two categories compared to the given findings.
- The infant's excellent cardiovascular (pulse 128 bpm = 2 points) and respiratory status (vigorous cry = 2 points) make a score of 6 too low.
Question 138: A 5-year-old boy is brought to the physician because of early morning headaches for the past 6 months. During this period, he has had severe nausea and occasional episodes of vomiting. For the past month, he has had difficulty walking and intermittent double vision. He was born at term and has been healthy apart from an episode of sinusitis 8 months ago that resolved spontaneously. He is at the 60th percentile for height and 50th percentile for weight. His temperature is 37.1°C (98.8°F), pulse is 80/min, and blood pressure is 105/64 mm Hg. Examination shows normal muscle strength and 2+ deep tendon reflexes bilaterally. He has a broad-based gait and impaired tandem gait. Fundoscopy shows bilateral swelling of the optic disc. There is esotropia of the left eye. Which of the following is the most likely diagnosis?
A. Schwannoma
B. Optic glioma
C. Meningioma
D. Hemangioblastoma
E. Medulloblastoma (Correct Answer)
Explanation: ***Medulloblastoma***
- The constellation of **early morning headaches**, **nausea/vomiting**, **papilledema** (swelling of the optic disc), **ataxia** (difficulty walking, broad-based gait, impaired tandem gait), and **cranial nerve palsy** (esotropia from abducens nerve dysfunction) in a young child strongly indicates increased intracranial pressure secondary to a posterior fossa tumor. **Medulloblastoma** is the most common malignant posterior fossa tumor in children.
- The location in the **cerebellum** explains the gait abnormalities (ataxia), and its rapid growth often leads to **hydrocephalus** and raised ICP symptoms.
*Schwannoma*
- **Schwannomas** typically arise from cranial nerves (most commonly the vestibular nerve, causing acoustic neuromas) and are rare in children.
- They tend to be **slow-growing** and usually present with localized symptoms like hearing loss or facial nerve weakness, rather than diffuse signs of increased ICP and ataxia.
*Optic glioma*
- **Optic gliomas** arise from the optic nerve and primarily cause **vision loss**, proptosis, and strabismus.
- While they can cause hydrocephalus if large and compressive, they typically do not cause pronounced cerebellar signs like ataxia, and primary presentation with early morning headaches and vomiting would be less common than vision issues.
*Meningioma*
- **Meningiomas** are typically **benign tumors** arising from the meninges that are rare in children and usually occur in older adults.
- They are slow-growing and often present with focal neurological deficits related to their location, but they are an improbable diagnosis given the age and constellation of rapidly developing symptoms of increased ICP and cerebellar dysfunction.
*Hemangioblastoma*
- **Hemangioblastomas** are vascular tumors, often associated with **von Hippel-Lindau disease**, and are typically found in the cerebellum, brainstem, or spinal cord.
- While they can cause cerebellar symptoms and increased ICP, they are more commonly seen in **adults** and are much rarer than medulloblastomas in children of this age.
Question 139: A 15-year-old boy is brought to the physician for a well-child visit. His parents are concerned that he has not had his growth spurt yet. As a child, he was consistently in the 60th percentile for height; now he is in the 25th percentile. His classmates make fun of his height and high-pitched voice. His parents are also concerned that he does not maintain good hygiene. He frequently forgets to shower and does not seem aware of his body odor. As an infant, he had bilateral orchidopexy for cryptorchidism and a cleft palate repair. He is otherwise healthy. Vital signs are within normal limits. On physical exam, axillary and pubic hair is sparse. Genitals are Tanner stage 1 and the testicles are 2 mL bilaterally. Which of the following is the most likely diagnosis?
A. Constitutional delay of puberty
B. Hyperprolactinemia
C. Hypothyroidism
D. Primary hypogonadism
E. Kallmann syndrome (Correct Answer)
Explanation: ***Kallmann syndrome***
- This patient's presentation with **anosmia/hyposmia** (implied by poor hygiene and lack of awareness of body odor), **delayed puberty** (Tanner stage 1 at 15 years old, small testicular volume), and a history of **cryptorchidism** and **cleft palate** is highly suggestive of Kallmann syndrome.
- Kallmann syndrome is a form of **congenital hypogonadotropic hypogonadism** characterized by a deficiency in **GnRH** migration and function, leading to impaired sexual development and a lack of olfactory bulb development.
*Constitutional delay of puberty*
- While constitutional delay also presents with delayed puberty, it typically does **not include associated congenital anomalies** like cryptorchidism or cleft palate, nor does it present with features suggestive of anosmia.
- Children with constitutional delay often have a family history of delayed puberty, and their **growth deceleration** is usually less pronounced and still follows a growth curve.
*Hyperprolactinemia*
- **Hyperprolactinemia** causes hypogonadism by inhibiting GnRH, leading to delayed puberty, but it is not associated with **anosmia**, **cryptorchidism**, or **cleft palate**.
- It would typically be investigated if central nervous system symptoms like **headaches** or **visual field defects** were present, or in the context of certain medications.
*Hypothyroidism*
- **Hypothyroidism** can cause delayed puberty and growth deceleration, but it is not associated with **anosmia**, **cryptorchidism**, or **cleft palate**.
- Other classic symptoms of hypothyroidism, such as **fatigue, weight gain, cold intolerance, and constipation**, are not mentioned.
*Primary hypogonadism*
- **Primary hypogonadism** (e.g., Klinefelter syndrome) would present with elevated gonadotropins (LH and FSH) due to testicular failure, unlike the hypogonadotropic hypogonadism seen in Kallmann syndrome.
- While cryptorchidism can lead to primary hypogonadism, the additional features of **anosmia/hyposmia** and **cleft palate** point specifically to Kallmann syndrome.
Question 140: A 6-month-old boy is brought to the emergency department by his mother, who informs the doctor that her alcoholic husband hit the boy hard on his back. The blow was followed by excessive crying for several minutes and the development of redness in the area. On physical examination, the boy is dehydrated, dirty, and irritable and when the vital signs are checked, they reveal tachycardia. He cries immediately upon the physician touching the area around his left scapula. The doctor strongly suspects a fracture of the 6th, 7th, or 8th retroscapular posterior ribs. Evaluation of his skeletal survey is normal. The clinician is concerned about child abuse in this case. Which of the following is the most preferred imaging technique as the next step in the diagnostic evaluation of the infant?
A. Bedside ultrasonography
B. Magnetic resonance imaging
C. Babygram
D. Chest computed tomography scan
E. Skeletal survey in 2 weeks (Correct Answer)
Explanation: ***Skeletal survey in 2 weeks***
- A repeat **skeletal survey in 2 weeks** is the most appropriate next step in suspected child abuse cases with an initial normal survey, as it allows for the detection of **healing fractures** that may not be apparent immediately after injury.
- New bone formation and callus development around a fracture site become radiographically visible after approximately 7 to 14 days, improving the detection rate of subtle or undisplaced fractures.
*Bedside ultrasonography*
- While **ultrasonography** can detect acute fractures, especially in cartilage and non-ossified bones, its utility in a comprehensive assessment for multiple non-displaced rib fractures as part of a child abuse workup is limited.
- It is highly **operator-dependent** and may not provide the full skeletal overview required in suspected child abuse.
*Magnetic resonance imaging*
- **MRI** is excellent for evaluating soft tissue injuries, bone marrow edema, and non-ossified cartilaginous structures. However, it is not the primary imaging modality for detecting acute or subacute fractures of ossified bone and requires **sedation** in infants, making it less practical for routine skeletal screening.
- The **high cost** and limited availability of MRI also make it less suitable as a first-line diagnostic tool for rib fractures in this context.
*Babygram*
- A **babygram** is a single large radiograph of an infant's entire body, often used to rapidly assess for gross developmental anomalies or immediate concerns.
- It provides **less detailed imaging** of individual bones compared to a standard skeletal survey and is insufficient for reliably detecting subtle or non-displaced rib fractures.
*Chest computed tomography scan*
- A **chest CT scan** is highly sensitive for detecting acute rib fractures, even subtle ones. However, it exposes the infant to **significant radiation** and is usually reserved for specific clinical indications, such as suspected internal organ injury, rather than as a primary screening tool for rib fractures in child abuse in an otherwise stable patient.
- It does not provide a comprehensive view of the entire skeleton, which is crucial for identifying other potential abuse-related injuries elsewhere.
