Adolescent Medicine — MCQs

Adolescent Medicine Indian Medical PG Practice Questions and MCQs

Question 41: A child presents with bouts of laughter. What is the most likely diagnosis?

A. Russell-Silver syndrome
B. Angelman syndrome (Correct Answer)
C. Prader-Willi syndrome
D. Fragile X syndrome

Explanation: **Explanation:** The correct diagnosis is **Angelman syndrome**, a neurodevelopmental disorder characterized by a distinct behavioral phenotype often referred to as a "Happy Puppet" appearance. **Why Angelman Syndrome is correct:** Angelman syndrome is caused by the loss of function of the **maternally inherited UBE3A gene** on chromosome **15q11-q13** (most commonly via maternal deletion). Clinically, these children exhibit a frequent happy demeanor, characterized by **paroxysms of laughter**, smiling, and an excitable personality. Other key features include severe intellectual disability, speech impairment, ataxia (jerky movements), and microcephaly. **Why the other options are incorrect:** * **Russell-Silver Syndrome:** Primarily a growth disorder characterized by intrauterine growth restriction (IUGR), short stature, triangular facies, and limb asymmetry. It is not associated with paroxysmal laughter. * **Prader-Willi Syndrome:** Caused by the loss of the **paternally inherited** genes on the same region (15q11-q13). It presents with neonatal hypotonia, hyperphagia leading to early-onset obesity, and hypogonadism, but not bouts of laughter. * **Fragile X Syndrome:** The most common cause of inherited intellectual disability in males. It presents with macroorchidism, large ears, and a long face. While behavioral issues like ADHD or autism are common, spontaneous bouts of laughter are not a hallmark. **High-Yield Clinical Pearls for NEET-PG:** * **Genetics:** Angelman = Maternal deletion/Paternal Uniparental Disomy (UPD). Prader-Willi = Paternal deletion/Maternal UPD. * **Mnemonic:** **A**ngelman involves **A**bsent **M**aternal contribution (Happy **A**ngel). * **EEG Finding:** High-amplitude slow-wave activity (noted even in the absence of seizures) is common in Angelman syndrome. * **Key Feature:** "Happy Puppet" gait (ataxic, wide-based, with uplifted flexed arms).

Question 42: What is the normal menstrual cycle duration in an adolescent?

A. 21-35 days
B. 21-45 days (Correct Answer)
C. 24-38 days
D. 24-45 days

Explanation: **Explanation:** The correct answer is **B. 21-45 days**. **1. Understanding the Concept:** In adolescents, the hypothalamic-pituitary-ovarian (HPO) axis is immature during the first few years following menarche. This immaturity often leads to anovulatory cycles, resulting in greater variability in cycle length compared to adults. According to the American Academy of Pediatrics (AAP) and ACOG, the normal range for menstrual cycle length in adolescents is **21 to 45 days**. This wider window accounts for the physiological irregularity common in the first 2–3 years post-menarche. **2. Analysis of Incorrect Options:** * **A. 21-35 days:** This is the standard normal range for **adult women**. Using this criteria for adolescents would lead to over-diagnosing oligomenorrhea. * **C. 24-38 days:** This range is defined by FIGO for adult menstruation but does not account for adolescent physiological variability. * **D. 24-45 days:** While the upper limit is correct for adolescents, the lower limit is too restrictive (21 days is the accepted lower bound). **3. High-Yield Clinical Pearls for NEET-PG:** * **Menarcheal Age:** The average age of menarche is 12.4 years. * **Cycle Duration:** Normal flow lasts **2–7 days**; using more than 6–8 pads/day is considered abnormal. * **Maturity Timeline:** It typically takes **2 to 5 years** after menarche for the HPO axis to mature and for cycles to settle into the adult 21–35 day range. * **Red Flag:** Any cycle shorter than 20 days or longer than 90 days (even in the first year) warrants clinical evaluation.

Question 43: What is the most common chronic arthritis seen in children?

A. Juvenile Rheumatoid Arthritis (Correct Answer)
B. Rheumatic Arthritis
C. Rheumatic Fever
D. Septic Arthritis

Explanation: **Explanation:** **Juvenile Rheumatoid Arthritis (JRA)**, now more commonly referred to as **Juvenile Idiopathic Arthritis (JIA)**, is the most common chronic arthritic condition in the pediatric population. It is defined as arthritis of unknown etiology persisting for at least 6 weeks in a child younger than 16 years. The pathogenesis involves a chronic T-cell mediated inflammatory response leading to synovial hypertrophy (pannus formation) and potential joint destruction. **Analysis of Options:** * **Rheumatic Arthritis (Rheumatoid Arthritis):** While common in adults, classic adult-onset RA is rare in children. JIA is a distinct clinical entity with different genetic markers (e.g., HLA-B27, HLA-DR4) and clinical subtypes (Oligoarticular, Polyarticular, Systemic). * **Rheumatic Fever:** This is an acute, non-suppurative inflammatory response following a Group A Streptococcal infection. While it causes "migratory polyarthritis," the joint involvement is typically **acute and transient**, not chronic, and usually leaves no permanent joint damage. * **Septic Arthritis:** This is an **acute bacterial infection** of the joint space (most commonly *S. aureus*). It is a medical emergency characterized by sudden onset, high fever, and monoarthritis. It is not a chronic condition. **Clinical Pearls for NEET-PG:** * **Oligoarticular JIA:** The most common subtype (approx. 50%). It carries the highest risk of **chronic asymptomatic uveitis**; regular slit-lamp exams are mandatory. * **Systemic JIA (Still’s Disease):** Characterized by daily "quotidian" fevers, evanescent salmon-pink rashes, and hepatosplenomegaly. * **Uveitis Marker:** Positive **ANA (Antinuclear Antibody)** in JIA is a strong predictor for the development of anterior uveitis. * **First-line Treatment:** NSAIDs are typically the initial therapy, followed by Methotrexate (DMARD) for persistent disease.

Question 44: What is a common first-trimester ultrasound finding suggestive of Down syndrome?

A. Nuchal thickening
B. Nuchal translucency (Correct Answer)
C. Cardiac anomalies
D. Gastrointestinal anomalies

Explanation: **Explanation:** **Nuchal Translucency (NT)** is the correct answer because it is the most sensitive and specific first-trimester ultrasound marker for Down syndrome (Trisomy 21). It refers to the sonographic appearance of a collection of fluid under the skin behind the fetal neck, measured between **11 and 13 weeks 6 days** of gestation. An increased NT (typically >3.0 mm or >95th percentile for crown-rump length) is strongly associated with chromosomal aneuploidies, particularly Trisomy 21, 18, and 13. **Analysis of Incorrect Options:** * **A. Nuchal thickening:** While similar in name, "Nuchal Fold Thickening" is a **second-trimester** marker (measured between 16–20 weeks). A thickness of ≥6 mm is considered abnormal. * **C. Cardiac anomalies:** While common in Down syndrome (e.g., Atrioventricular Septal Defects), these are typically detailed during the second-trimester anomaly scan rather than being the primary screening finding in the first trimester. * **D. Gastrointestinal anomalies:** Conditions like duodenal atresia ("double bubble" sign) are classic for Down syndrome but usually manifest and are diagnosed in the **late second or third trimester**. **High-Yield Clinical Pearls for NEET-PG:** * **Combined Screening:** The most effective first-trimester screen (90% detection rate) combines **NT measurement**, **PAPP-A** (decreased), and **free β-hCG** (increased). * **Nasal Bone:** The absence of the nasal bone on a first-trimester scan is another highly specific marker for Down syndrome. * **Soft Markers:** Other second-trimester markers include echogenic intracardiac focus, echogenic bowel, and short femur/humerus.

Question 45: A neonate is suspected to be suffering from necrotizing enterocolitis (NEC). On further examination and investigation, he is diagnosed to be Bell's stage I NEC. What is the management of choice?

A. Laparotomy and proceed
B. Incision of bilateral pelvic drains
C. Conservative management with IV fluids and antibiotics (Correct Answer)
D. Initial conservative management and laparotomy after 24 hours

Explanation: **Explanation:** Necrotizing Enterocolitis (NEC) is the most common gastrointestinal emergency in neonates, primarily affecting preterm infants. Management is strictly guided by the **Modified Bell’s Staging Criteria**, which categorizes the severity based on clinical and radiological findings. **Why Option C is Correct:** **Bell’s Stage I (Suspected NEC)** is characterized by non-specific systemic signs (lethargy, apnea), mild gastrointestinal symptoms (abdominal distension, occult blood in stools), and normal or non-specific radiographs. At this early stage, the bowel wall is intact, and there is no perforation. The standard of care is **conservative management**, which includes: * NPO (Nil Per Oral) status to rest the bowel. * Nasogastric decompression. * Intravenous fluids and parenteral nutrition. * Empiric systemic antibiotics for 3–7 days. **Why Other Options are Incorrect:** * **Option A & B:** Surgical interventions like laparotomy or peritoneal drainage are reserved for **Stage III (Advanced NEC)**, specifically when there is evidence of intestinal perforation (pneumoperitoneum) or clinical deterioration despite maximal medical therapy. * **Option D:** There is no "mandatory" 24-hour delayed laparotomy. Surgery is indicated only if the patient fails to respond to medical management or develops signs of gangrene/perforation. **High-Yield Clinical Pearls for NEET-PG:** * **Bell’s Stage II (Proven NEC):** Characterized by **Pneumatosis intestinalis** (gas in the bowel wall) on X-ray. Management remains medical but with longer antibiotic courses (7–14 days). * **Bell’s Stage III (Advanced NEC):** Characterized by **Pneumoperitoneum** (Rigler’s sign/Football sign) or portal venous gas. * **Absolute Indication for Surgery:** Pneumoperitoneum (perforation). * **Most common site:** Terminal ileum and proximal colon.

Question 46: Growth spurt occurs at __________

A. Just before appearance of axillary hair
B. Just before menarche (Correct Answer)
C. After 16 years
D. Before thelarche

Explanation: **Explanation:** The adolescent growth spurt is a hallmark of puberty, characterized by a rapid increase in height and weight. In girls, the sequence of pubertal changes follows a predictable pattern: **Thelarche** (breast development) → **Pubarche** (pubic hair) → **Peak Height Velocity (PHV)** → **Menarche** (onset of menstruation). **1. Why the correct answer is right:** The **Peak Height Velocity (PHV)** in girls occurs during Tanner Stage 2–3 of breast development. Crucially, this growth spurt occurs **approximately 6 to 12 months before menarche**. Once menarche occurs, the epiphyses of the long bones begin to fuse due to the influence of estrogen, and linear growth slows down significantly (usually only 5–7 cm of total height is gained post-menarche). **2. Why the incorrect options are wrong:** * **Option A:** Axillary hair typically appears in Tanner Stage 3 or 4, often coinciding with or slightly following the peak growth spurt. It is not the primary landmark used to time the spurt. * **Option C:** In girls, the growth spurt usually occurs between ages 10.5 and 12.5 years. By age 16, most girls have already reached their near-final adult height. * **Option D:** Thelarche is the **first** sign of puberty in girls. The growth spurt follows thelarche; it does not precede it. **High-Yield Clinical Pearls for NEET-PG:** * **Sequence in Girls:** Thelarche (earliest) → Adrenarche → PHV → Menarche (latest). * **Sequence in Boys:** Testicular enlargement (>4ml) is the first sign. The growth spurt in boys occurs **later** (Tanner Stage 4) compared to girls. * **SMR (Sexual Maturity Rating):** PHV in girls occurs at SMR 2-3; in boys, it occurs at SMR 4. * **Precocious Puberty:** Defined as secondary sexual characteristics before age 8 in girls and age 9 in boys.

Question 47: What are the diagnostic criteria for Juvenile Rheumatoid Arthritis (JRA)?

A. Disease persisting for 6 weeks or longer (Correct Answer)
B. Onset before 16 years of age
C. Arthritis involving more than 5 joints
D. Polyarticular JRA Anti-nuclear antibody (ANA) is positive

Explanation: **Explanation:** Juvenile Rheumatoid Arthritis (JRA), now more commonly referred to under the broader classification of **Juvenile Idiopathic Arthritis (JIA)**, is defined by a specific set of clinical criteria to differentiate it from transient viral arthritis or other childhood febrile illnesses. 1. **Why Option A is correct:** The hallmark of JRA/JIA is **chronic** synovial inflammation. To satisfy the diagnostic criteria, arthritis (defined as joint swelling or limitation of motion with heat, pain, or tenderness) must persist for a minimum of **6 weeks**. This duration is essential to rule out self-limiting conditions like toxic synovitis or reactive arthritis. 2. **Why other options are incorrect:** * **Option B:** While the onset must indeed be before **16 years of age**, this is a demographic requirement rather than the defining diagnostic feature of the disease's persistence. (Note: In many exams, if both A and B are present, "6 weeks duration" is the more specific clinical "rule-in" criterion). * **Option C:** Arthritis involving more than 5 joints defines the **Polyarticular subtype**, but it is not a requirement for the general diagnosis of JRA, which also includes Pauciarticular (≤4 joints) and Systemic-onset types. * **Option D:** ANA positivity is a common laboratory finding (especially in girls with pauciarticular JRA) and correlates with an increased risk of **chronic uveitis**, but it is not a mandatory diagnostic criterion. **High-Yield Clinical Pearls for NEET-PG:** * **Systemic JIA (Still’s Disease):** Characterized by daily "quotidian" spikes of high fever and a salmon-colored evanescent rash. * **Most Common Subtype:** Pauciarticular (Oligoarticular) JIA; it carries the highest risk for asymptomatic iridocyclitis (requires frequent slit-lamp exams). * **RF Factor:** Most JRA patients are **RF negative**; RF positivity is usually seen only in late-onset polyarticular cases and indicates a poorer prognosis.

Question 48: Which of the following findings is NOT true about Fragile X syndrome?

A. Large testis
B. Pigmented nevi (Correct Answer)
C. Large ear
D. Long face

Explanation: **Explanation:** Fragile X syndrome is the most common cause of **inherited intellectual disability** and the most common single-gene cause of autism. It is caused by an expansion of the **CGG trinucleotide repeat** in the *FMR1* gene on the X chromosome, leading to the silencing of the FMRP protein. **Why "Pigmented nevi" is the correct answer:** Pigmented nevi (or Café-au-lait spots) are characteristic of **Neurofibromatosis Type 1 (NF1)**, not Fragile X syndrome. While Fragile X involves connective tissue dysplasia, it does not typically present with specific dermatological pigmentary lesions like nevi. **Analysis of incorrect options:** * **Large testis (Macro-orchidism):** This is the hallmark clinical feature of Fragile X, usually becoming most apparent post-puberty. It is caused by an accumulation of interstitial fluid and connective tissue changes. * **Large ears and Long face:** These are classic craniofacial dysmorphic features. Patients typically exhibit a prominent forehead, a long, narrow face, and large, protruding ears due to underlying connective tissue weakness. **High-Yield Clinical Pearls for NEET-PG:** * **Genetics:** X-linked dominant inheritance with variable expressivity; involves **"Anticipation"** (symptoms become more severe in successive generations). * **Trinucleotide Repeat:** CGG (Mnemonic: **C**GG = **C**hin, **G**iant **G**onads). * **Behavioral Profile:** ADHD, hand-flapping, poor eye contact, and social anxiety. * **Other Physical Signs:** High arched palate, mitral valve prolapse (MVP), and joint hypermobility. * **Diagnosis:** Molecular analysis (PCR or Southern Blot) is the gold standard; cytogenetic testing (showing the "fragile" site) is now largely historical.

Question 49: Delayed puberty is defined as the absence of secondary sexual development by what age in the absence of primary amenorrhea?

A. 12 years
B. 14 years
C. 16 years (Correct Answer)
D. 18 years

Explanation: **Explanation:** Delayed puberty is clinically defined based on the absence of specific pubertal milestones by a certain age. In females, the definition is twofold: 1. **Absence of secondary sexual characteristics** (specifically breast development/Thelarche) by **age 13**. 2. **Absence of menarche** (Primary Amenorrhea) by **age 16**, even if secondary sexual characteristics are present. The question specifically asks for the age definition in the **absence of primary amenorrhea** (meaning, at what age do we diagnose delayed puberty if the girl has not yet started her periods). According to standard pediatric and gynecological guidelines, if a girl has not achieved menarche by age 16, it is classified as delayed puberty/primary amenorrhea, regardless of whether she has breast development. **Analysis of Options:** * **A (12 years):** This is within the normal range for pubertal onset; the average age of menarche is approximately 12.5 years. * **B (14 years):** While 14 is the cutoff for boys (absence of testicular enlargement), in girls, it is only considered delayed at 14 if there is also an absence of secondary sexual characteristics. * **D (18 years):** This is far beyond the clinical threshold for intervention and would represent a significant pathological delay. **High-Yield Clinical Pearls for NEET-PG:** * **First sign of puberty:** In girls, it is **Thelarche** (Breast budding); in boys, it is **Testicular enlargement** (>4ml volume). * **Precocious Puberty:** Development of secondary sexual characteristics before **age 8** in girls and **age 9** in boys. * **Most common cause of delayed puberty:** Constitutional Delay of Growth and Puberty (CDGP) – often associated with a positive family history and delayed bone age. * **Kallmann Syndrome:** A key differential for delayed puberty characterized by hypogonadotropic hypogonadism and **anosmia**.

Question 50: In males, first pubertal sign is:

A. Pubic hair development
B. Hoarseness of voice
C. Penis enlargement
D. Testicular enlargement (Correct Answer)

Explanation: ***Testicular enlargement*** - The first noticeable sign of puberty in males is typically **testicular enlargement**, followed by other changes. - This enlargement is due to the increase in the size of the **seminiferous tubules** and the production of sperm. *Pubic hair development* - While pubic hair development is an important pubertal sign, it usually follows **testicular enlargement**, appearing as the second or third sign. - It is driven by the increase in **adrenal androgens** and **testosterone**. *Hoarseness of voice* - The voice change or **deepening (hoarseness)** usually occurs later in puberty, as the larynx grows and vocal cords lengthen. - This is a secondary sexual characteristic mediated by **testosterone**. *Penis enlargement* - **Penis enlargement** typically begins after testicular enlargement has been established, usually around a Tanner stage 3. - This growth is also directly stimulated by increasing levels of **testosterone**.

Practice by Chapter

Adolescent Growth and Development

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Puberty and Its Disorders

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Adolescent Sexuality

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Sexually Transmitted Infections

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Adolescent Pregnancy

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Menstrual Disorders

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Substance Use Disorders

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Mental Health Issues in Adolescents

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Eating Disorders

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Sports Medicine for Adolescents

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Transition to Adult Care

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Confidentiality and Consent Issues

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