A 4-week-old infant is brought to the emergency department by his parents with violent vomiting. It started about 3 days ago and has slowly gotten worse. He vomits after most feedings but seems to keep some formula down. His mother notes that he is eager to feed between episodes and seems to be putting on weight. Other than an uncomplicated course of chlamydia conjunctivitis, the infant has been healthy. He was born at 39 weeks gestation via spontaneous vaginal delivery. He is up to date on all vaccines and is meeting all developmental milestones. The physical exam is significant for a palpable mass in the right upper quadrant. What is the first-line confirmatory diagnostic test and associated finding?
Q2
A 52-year-old man comes to the physician because of a 3-month history of upper abdominal pain and nausea that occurs about 3 hours after eating and at night. These symptoms improve with eating. After eating, he often has a feeling of fullness and bloating. He has had several episodes of dark stools over the past month. He has smoked one pack of cigarettes daily for 40 years and drinks 2 alcoholic beverages daily. He takes no medications. His temperature is 36.4°C (97.5°F), pulse is 80/min, and blood pressure is 110/70 mm Hg. Abdominal examination shows epigastric tenderness with no guarding or rebound. Bowel sounds are normal. Which of the following treatments is most appropriate to prevent further complications of the disease in this patient?
Q3
A 4700-g (10.3-lb) male newborn is delivered at 37 weeks' gestation to a 30-year-old woman, gravida 2, para 1. Apgar scores are 7 and 8 at 1 and 5 minutes, respectively. The newborn appears pale. Temperature is 37°C (98.6°F), pulse is 180/min, and blood pressure is 90/60 mm Hg. Examination in the delivery room shows midfacial hypoplasia, infraorbital creases, and a large tongue. The right side of the body is larger than the left. Abdominal examination shows that the abdominal viscera protrudes through the abdominal wall at the umbilicus; the viscera are covered by the amniotic membrane and the peritoneum. The liver is palpated 2–3 cm below the right costal margin. Fingerstick blood glucose concentration is 60 mg/dL. Ultrasonography of the abdomen shows enlarged kidneys bilaterally. In addition to surgical closure of the abdominal wall, which of the following is the most appropriate next step in management?
Q4
A 19-year-old woman, gravida 1, para 0, at 21 weeks’ gestation comes to the physician for a follow-up prenatal visit. At her previous appointment, her serum α-fetoprotein concentration was elevated. She had smoked 1 pack of cigarettes daily for 3 years but quit at 6 weeks' gestation. Examination shows a uterus consistent in size with a 21-week gestation. Ultrasonography shows fetal viscera suspended freely into the amniotic cavity. Which of the following is the most likely diagnosis?
Q5
A 28-year-old male presents to his primary care physician with complaints of intermittent abdominal pain and alternating bouts of constipation and diarrhea. His medical chart is not significant for any past medical problems or prior surgeries. He is not prescribed any current medications. Which of the following questions would be the most useful next question in eliciting further history from this patient?
Congenital abdominal wall defects US Medical PG Practice Questions and MCQs
Question 1: A 4-week-old infant is brought to the emergency department by his parents with violent vomiting. It started about 3 days ago and has slowly gotten worse. He vomits after most feedings but seems to keep some formula down. His mother notes that he is eager to feed between episodes and seems to be putting on weight. Other than an uncomplicated course of chlamydia conjunctivitis, the infant has been healthy. He was born at 39 weeks gestation via spontaneous vaginal delivery. He is up to date on all vaccines and is meeting all developmental milestones. The physical exam is significant for a palpable mass in the right upper quadrant. What is the first-line confirmatory diagnostic test and associated finding?
A. Abdominal ultrasound; elongated pyloric channel and muscle hypertrophy (Correct Answer)
B. Barium upper GI series; GE junction and portion of the stomach in thorax
C. Air enema; filling defect and coil spring sign
D. Barium upper GI series; bird beak sign and corkscrewing
E. Abdominal X-ray; ‘double bubble’ sign
Explanation: ***Abdominal ultrasound; elongated pyloric channel and muscle hypertrophy***
- The clinical picture of **projectile vomiting** in a 4-week-old infant, **eagerness to feed** ("hungry vomiter"), and **palpable olive-shaped mass** in the right upper quadrant is classic for **pyloric stenosis**.
- **Abdominal ultrasonography** is the gold standard for diagnosis, revealing an **elongated pyloric channel** (>16mm) and thickened pyloric muscle (>3-4mm).
- Pyloric stenosis typically presents between 3-6 weeks of age with progressive non-bilious vomiting.
*Barium upper GI series; GE junction and portion of the stomach in thorax*
- A **barium upper GI series** showing the **GE junction and stomach in the thorax** would indicate a **hiatal hernia**, which is not consistent with the palpable mass or "hungry vomiter" presentation.
- While hiatal hernias can cause vomiting and reflux, they typically don't present with this specific type of projectile vomiting or a palpable abdominal mass.
*Air enema; filling defect and coil spring sign*
- An **air enema** showing a **filling defect** and **coil spring sign** is characteristic of **intussusception**, which usually presents with sudden onset of **crampy abdominal pain**, **currant jelly stools**, and a palpable mass in the right lower quadrant.
- The clinical presentation does not fit intussusception, which typically occurs in older infants (6-36 months) and has a more acute presentation.
*Barium upper GI series; bird beak sign and corkscrewing*
- A **barium upper GI series** showing a **bird beak sign** and **corkscrewing** is pathognomonic for **midgut volvulus**, a surgical emergency.
- While volvulus can cause bilious vomiting and abdominal distension, the presentation of non-bilious vomiting with a palpable pyloric mass is more typical of pyloric stenosis.
*Abdominal X-ray; 'double bubble' sign*
- An **abdominal X-ray** revealing a **'double bubble' sign** is indicative of **duodenal atresia** or **annular pancreas**, leading to complete duodenal obstruction.
- This condition typically presents with **bilious vomiting** shortly after birth (within first day of life) and does not involve a palpable hypertrophied pylorus.
Question 2: A 52-year-old man comes to the physician because of a 3-month history of upper abdominal pain and nausea that occurs about 3 hours after eating and at night. These symptoms improve with eating. After eating, he often has a feeling of fullness and bloating. He has had several episodes of dark stools over the past month. He has smoked one pack of cigarettes daily for 40 years and drinks 2 alcoholic beverages daily. He takes no medications. His temperature is 36.4°C (97.5°F), pulse is 80/min, and blood pressure is 110/70 mm Hg. Abdominal examination shows epigastric tenderness with no guarding or rebound. Bowel sounds are normal. Which of the following treatments is most appropriate to prevent further complications of the disease in this patient?
A. Intravenous vitamin B12 supplementation
B. Truncal vagotomy
C. Amoxicillin, clarithromycin, and omeprazole (Correct Answer)
D. Fundoplication, hiatoplasty, and gastropexy
E. Distal gastrectomy with gastroduodenostomy
Explanation: ***Amoxicillin, clarithromycin, and omeprazole***
- This patient's symptoms (epigastric pain 3 hours after eating and at night, improvement with eating, dark stools) are highly suggestive of a **duodenal ulcer complicated by upper gastrointestinal bleeding**. The most common cause of duodenal ulcers is *H. pylori* infection.
- The recommended first-line treatment for *H. pylori* infection involves a triple therapy regimen, including two antibiotics (like **amoxicillin and clarithromycin**) to eradicate the bacteria and a **proton pump inhibitor (omeprazole)** to reduce acid production and promote ulcer healing.
*Intravenous vitamin B12 supplementation*
- This treatment is appropriate for **vitamin B12 deficiency**, which can occur in conditions like atrophic gastritis, pernicious anemia, or following gastric resections, but is not indicated for acute peptic ulcer disease and wouldn't address the primary pathology.
- There is no clinical indication in the patient's presentation (e.g., neurological symptoms, macrocytic anemia) to suggest a deficiency in vitamin B12.
*Truncal vagotomy*
- **Truncal vagotomy** is a surgical procedure that was historically performed to reduce gastric acid secretion by cutting the vagus nerve. It is rarely used now due to the effectiveness of medical therapies for peptic ulcer disease.
- This invasive surgical option is generally reserved for refractory cases of peptic ulcer disease not responsive to medical management, or when complications like uncontrolled bleeding or perforation necessitate surgical intervention.
*Fundoplication, hiatoplasty, and gastropexy*
- These surgical procedures are primarily used to treat **gastroesophageal reflux disease (GERD)** and **hiatal hernia**, not peptic ulcer disease.
- Fundoplication wraps the stomach fundus around the lower esophagus to reinforce the lower esophageal sphincter, addressing reflux symptoms which are not the primary complaint here.
*Distal gastrectomy with gastroduodenostomy*
- **Distal gastrectomy** is a major surgical procedure involving the removal of the distal part of the stomach. It is typically reserved for severe complications of peptic ulcer disease (e.g., perforation, obstruction, recurrent bleeding unresponsive to other treatments) or gastric cancer.
- While it might be considered in extreme cases of complicated peptic ulcer, it is not the initial or most appropriate treatment for preventing further complications in a patient who has yet to receive standard anti-*H. pylori* therapy.
Question 3: A 4700-g (10.3-lb) male newborn is delivered at 37 weeks' gestation to a 30-year-old woman, gravida 2, para 1. Apgar scores are 7 and 8 at 1 and 5 minutes, respectively. The newborn appears pale. Temperature is 37°C (98.6°F), pulse is 180/min, and blood pressure is 90/60 mm Hg. Examination in the delivery room shows midfacial hypoplasia, infraorbital creases, and a large tongue. The right side of the body is larger than the left. Abdominal examination shows that the abdominal viscera protrudes through the abdominal wall at the umbilicus; the viscera are covered by the amniotic membrane and the peritoneum. The liver is palpated 2–3 cm below the right costal margin. Fingerstick blood glucose concentration is 60 mg/dL. Ultrasonography of the abdomen shows enlarged kidneys bilaterally. In addition to surgical closure of the abdominal wall, which of the following is the most appropriate next step in management?
A. Serum 17-hydroxyprogesterone measurement
B. Serum TSH measurement
C. Serum IGF-1 measurement
D. Cranial MRI
E. Serial abdominal ultrasonography (Correct Answer)
Explanation: ***Serial abdominal ultrasonography***
- The combination of **macrosomia**, **omphalocele**, **hemihyperplasia**, **visceromegaly** (large kidneys and liver), **macroglossia** (large tongue), and **facial anomalies** is highly suggestive of **Beckwith-Wiedemann Syndrome (BWS)**.
- Children with BWS have an increased risk of developing specific **embryonal tumors**, including **Wilms tumor** and **hepatoblastoma**, making regular abdominal ultrasonography crucial for early detection.
- **Current guidelines recommend abdominal ultrasound every 3 months until age 8** for tumor surveillance.
- Note: The mild hypoglycemia (60 mg/dL) should be monitored, as neonatal hypoglycemia is common in BWS, but tumor surveillance is the critical long-term management priority.
*Serum 17-hydroxyprogesterone measurement*
- This test is used to screen for **congenital adrenal hyperplasia (CAH)**.
- The clinical presentation does not suggest CAH, as there are no signs of **ambiguous genitalia** or **salt-wasting crisis**.
*Serum TSH measurement*
- **Thyroid-stimulating hormone (TSH)** is measured to screen for **congenital hypothyroidism**.
- While lethargy and feeding difficulties can occur in hypothyroidism, the described constellation of anomalies, especially macrosomia and omphalocele, is not characteristic of this condition.
*Serum IGF-1 measurement*
- **Insulin-like growth factor 1 (IGF-1)** levels are primarily evaluated in cases of suspected **growth hormone deficiency** or **excess (gigantism/acromegaly)**.
- While BWS involves overgrowth, the initial diagnostic and screening approach for associated tumor risk does not involve IGF-1 measurement.
*Cranial MRI*
- **Cranial MRI** is indicated for neurological symptoms or suspected brain anomalies.
- The patient's presentation does not include any neurological deficits or signs suggesting intracranial pathology as the primary concern.
Question 4: A 19-year-old woman, gravida 1, para 0, at 21 weeks’ gestation comes to the physician for a follow-up prenatal visit. At her previous appointment, her serum α-fetoprotein concentration was elevated. She had smoked 1 pack of cigarettes daily for 3 years but quit at 6 weeks' gestation. Examination shows a uterus consistent in size with a 21-week gestation. Ultrasonography shows fetal viscera suspended freely into the amniotic cavity. Which of the following is the most likely diagnosis?
A. Omphalocele
B. Vesicourachal diverticulum
C. Umbilical hernia
D. Gastroschisis (Correct Answer)
E. Diaphragmatic hernia
Explanation: ***Gastroschisis***
- This condition is characterized by **fetal viscera suspended freely into the amniotic cavity**, indicating an abdominal wall defect where organs are exposed directly.
- **Elevated maternal serum α-fetoprotein (MSAFP)** is a classic finding in gastroschisis due to the direct exposure of fetal blood to the amniotic fluid.
*Omphalocele*
- In an omphalocele, the abdominal organs are covered by a **peritoneal sac**, which would not result in viscera "freely suspended" in the amniotic cavity.
- Omphaloceles are often associated with **chromosomal abnormalities** and other congenital anomalies, which are not suggested here.
*Vesicourachal diverticulum*
- This is a rare anomaly of the **urachus**, an embryonic remnant connecting the bladder to the umbilicus.
- It involves a diverticulum of the bladder and would **not cause exposed abdominal organs** or elevated MSAFP.
*Umbilical hernia*
- An umbilical hernia involves a protrusion of abdominal contents through the umbilical ring but is typically **covered by skin** and does not involve free exposure of viscera.
- It usually presents as a **reducible bulge** and is not associated with elevated MSAFP in utero.
*Diaphragmatic hernia*
- This involves a defect in the diaphragm leading to abdominal organs migrating into the **thoracic cavity**, affecting lung development.
- While it can cause some elevation of MSAFP, the ultrasound finding of **viscera freely suspended in the amniotic cavity** is not consistent with a diaphragmatic hernia.
Question 5: A 28-year-old male presents to his primary care physician with complaints of intermittent abdominal pain and alternating bouts of constipation and diarrhea. His medical chart is not significant for any past medical problems or prior surgeries. He is not prescribed any current medications. Which of the following questions would be the most useful next question in eliciting further history from this patient?
A. "Does the diarrhea typically precede the constipation, or vice-versa?"
B. "Is the diarrhea foul-smelling?"
C. "Please rate your abdominal pain on a scale of 1-10, with 10 being the worst pain of your life"
D. "Are the symptoms worse in the morning or at night?"
E. "Can you tell me more about the symptoms you have been experiencing?" (Correct Answer)
Explanation: ***Can you tell me more about the symptoms you have been experiencing?***
- This **open-ended question** encourages the patient to provide a **comprehensive narrative** of their symptoms, including details about onset, frequency, duration, alleviating/aggravating factors, and associated symptoms, which is crucial for diagnosis.
- In a patient presenting with vague, intermittent symptoms like alternating constipation and diarrhea, allowing them to elaborate freely can reveal important clues that might not be captured by more targeted questions.
*Does the diarrhea typically precede the constipation, or vice-versa?*
- While knowing the sequence of symptoms can be helpful in understanding the **pattern of bowel dysfunction**, it is a very specific question that might overlook other important aspects of the patient's experience.
- It prematurely narrows the focus without first obtaining a broad understanding of the patient's overall symptomatic picture.
*Is the diarrhea foul-smelling?*
- Foul-smelling diarrhea can indicate **malabsorption** or **bacterial overgrowth**, which are important to consider in some gastrointestinal conditions.
- However, this is a **specific symptom inquiry** that should follow a more general exploration of the patient's symptoms, as it may not be relevant if other crucial details are missed.
*Please rate your abdominal pain on a scale of 1-10, with 10 being the worst pain of your life*
- Quantifying pain intensity is useful for assessing the **severity of discomfort** and monitoring changes over time.
- However, for a patient with intermittent rather than acute, severe pain, understanding the **character, location, and triggers** of the pain is often more diagnostically valuable than just a numerical rating initially.
*Are the symptoms worse in the morning or at night?*
- Diurnal variation can be relevant in certain conditions, such as inflammatory bowel diseases where nocturnal symptoms might be more concerning, or functional disorders whose symptoms might be stress-related.
- This is another **specific question** that should come after gathering a more complete initial picture of the patient's symptoms to ensure no key information is overlooked.
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