Adolescent Medicine — MCQs

Adolescent Medicine Indian Medical PG Practice Questions and MCQs

Question 11: Which of the following is a characteristic of a child with acute post-streptococcal glomerulonephritis?

A. Leukocytosis
B. Fever
C. Raised ASO titre (Correct Answer)
D. Pedal edema

Explanation: **Explanation:** **Acute Post-Streptococcal Glomerulonephritis (APSGN)** is a classic type-III hypersensitivity reaction occurring after an infection with nephritogenic strains of Group A Beta-hemolytic Streptococcus (GABHS). **Why Option C is Correct:** The diagnosis of APSGN requires evidence of a preceding streptococcal infection. A **Raised Antistreptolysin O (ASO) titre** is the most common serological marker used to confirm a prior pharyngeal streptococcal infection. It typically begins to rise 1–3 weeks after infection and peaks at 3–5 weeks. Note: ASO titres are often low or absent in cases following skin infections (impetigo); in those cases, Anti-DNase B is a more reliable marker. **Why Other Options are Incorrect:** * **A & B (Leukocytosis & Fever):** These are features of an *active* acute infection. APSGN is a post-infectious, immune-mediated complication that occurs after a latent period (1–2 weeks after pharyngitis or 3–6 weeks after pyoderma). By the time renal symptoms appear, the initial infection and its systemic inflammatory signs (fever, high WBC count) have usually resolved. * **D (Pedal Edema):** While edema is a hallmark of nephritic syndrome, in APSGN, it is typically **periorbital and facial** (puffiness) rather than pedal. Pedal edema is more characteristic of Nephrotic Syndrome due to severe hypoalbuminemia. **High-Yield Clinical Pearls for NEET-PG:** * **Low C3 Levels:** A hallmark of APSGN is a transient decrease in Serum C3 levels, which typically returns to normal within 6–8 weeks. * **Classic Triad:** Hematuria (Cola-colored urine), Hypertension, and Edema. * **Microscopy:** RBC casts are pathognomonic for glomerular bleeding. * **Prognosis:** Excellent in children; >95% recover completely with supportive care.

Question 12: In which of the following conditions is bone age typically decreased, except for one condition?

A. Congenital hypothyroidism
B. Constitutional delay of growth and puberty
C. Familial short stature (Correct Answer)
D. Rickets

Explanation: **Explanation:** The assessment of **Bone Age (BA)** is a critical tool in pediatric endocrinology to differentiate between various causes of short stature. Bone age reflects the biological maturation of the skeleton. **Why Familial Short Stature (FSS) is the correct answer:** In **Familial Short Stature**, the child’s height is genetically determined to be short (consistent with mid-parental height). Because the child is growing at their genetically programmed rate, the skeletal maturation is normal. Therefore, **Bone Age is equal to Chronological Age (BA = CA)**. This is the hallmark that distinguishes it from other growth delays. **Analysis of Incorrect Options:** * **Congenital Hypothyroidism:** Thyroid hormones are essential for epiphyseal mineralization. Deficiency leads to a significant lag in skeletal maturation, resulting in **BA < CA**. * **Constitutional Delay of Growth and Puberty (CDGP):** Often confused with FSS, CDGP is a "late bloomer" scenario. There is a temporary delay in the activation of the hypothalamic-pituitary-gonadal axis, leading to **BA < CA**. These children eventually reach a normal adult height because their bones stay "younger" for longer. * **Rickets:** Defective mineralization of the bone matrix (due to Vitamin D deficiency or other causes) leads to delayed appearance of ossification centers and widened growth plates, resulting in **BA < CA**. **NEET-PG High-Yield Pearls:** 1. **BA = CA:** Familial Short Stature, Iatrogenic/Genetic causes (usually). 2. **BA < CA (Delayed):** Hypothyroidism, Growth Hormone deficiency, Malnutrition, Chronic illness, CDGP, Rickets. 3. **BA > CA (Advanced):** Precocious puberty, Congenital Adrenal Hyperplasia (CAH), Hyperthyroidism, Obesity. 4. **Standard Method:** Bone age is most commonly assessed using an X-ray of the **Left Hand and Wrist** (Greulich and Pyle atlas).

Question 13: About trisomy 13, which of the following is a true statement?

A. Bilateral microphthalmia (Correct Answer)
B. Neurofibroma
C. Rocker bottom feet
D. Dermoid cyst

Explanation: **Explanation:** Trisomy 13, also known as **Patau Syndrome**, is a severe chromosomal anomaly characterized by a failure of midline development and defects in the prechordal mesoderm. **1. Why Option A is Correct:** Bilateral **microphthalmia** (abnormally small eyes) is a classic midline defect associated with Patau Syndrome. It often occurs alongside other ocular anomalies like coloboma or anophthalmia. The syndrome is defined by the "3 Ps": **P**olydactyly, **P**alates (Cleft lip/palate), and **P**unched-out scalp lesions (Aplasia cutis congenita). **2. Why the other options are incorrect:** * **Neurofibroma (B):** These are benign nerve sheath tumors characteristic of **Neurofibromatosis Type 1**, an autosomal dominant neurocutaneous syndrome, not a chromosomal trisomy. * **Rocker bottom feet (C):** While seen in Patau Syndrome, this is the **hallmark feature of Trisomy 18 (Edwards Syndrome)**. In NEET-PG, if forced to choose the most specific association, rocker bottom feet are classically linked to Edwards, whereas polydactyly is linked to Patau. * **Dermoid cyst (D):** These are developmental choristomas commonly found in the ovary or near the eyebrow. They are not a specific or diagnostic feature of Trisomy 13. **High-Yield Clinical Pearls for NEET-PG:** * **Holoprosencephaly:** The most severe neurological finding in Patau Syndrome (failure of the forebrain to divide). * **Aplasia Cutis Congenita:** Focal absence of skin on the scalp; a very high-yield "spotter" for Patau. * **Echogenic intracardiac focus:** Often seen on prenatal ultrasound. * **Prognosis:** Extremely poor; most infants do not survive beyond the first year of life.

Question 14: A patient presents with short stature, sexual infantilism, and congenital anomalies with chromosomal abnormality 'X0'. What is the diagnosis?

A. Turner's syndrome (Correct Answer)
B. Klinefelter syndrome
C. Testicular feminization syndrome
D. Gonadal agenesis

Explanation: ### Explanation **Correct Answer: A. Turner's Syndrome** **Why it is correct:** Turner’s Syndrome is the most common sex chromosome abnormality in females, characterized by the complete or partial absence of one X chromosome (**45,X0** karyotype). The clinical triad presented in the question is classic for this condition: 1. **Short Stature:** Due to the loss of the *SHOX* gene on the X chromosome. 2. **Sexual Infantilism:** Resulting from "streak ovaries" (gonadal dysgenesis), leading to primary amenorrhea and lack of secondary sexual characteristics due to estrogen deficiency. 3. **Congenital Anomalies:** Common features include a webbed neck (cystic hygroma remnant), shield chest (widely spaced nipples), and cubitus valgus. **Why the other options are incorrect:** * **B. Klinefelter Syndrome:** Characterized by a **47,XXY** karyotype. Patients are phenotypically male, typically tall, with small firm testes, gynecomastia, and infertility. * **C. Testicular Feminization Syndrome (Androgen Insensitivity Syndrome):** These individuals have a **46,XY** karyotype but a female phenotype due to androgen receptor resistance. They have normal breast development (unlike Turner's) but lack a uterus and ovaries. * **D. Gonadal Agenesis:** This is a general term for the failure of gonads to develop. While it occurs in Turner’s, the specific chromosomal finding of **X0** and the presence of associated somatic anomalies (like short stature) point specifically to Turner's Syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Cardiac Anomaly:** Bicuspid aortic valve (most common) and Coarctation of the aorta. * **Renal Anomaly:** Horseshoe kidney. * **Dermatological:** Multiple pigmented nevi and lymphedema of hands/feet at birth. * **Laboratory:** Elevated FSH and LH (Hypergonadotropic hypogonadism). * **Management:** Growth hormone (for height) and Estrogen replacement (for secondary sexual characteristics).

Question 15: In neonatal cholestasis, if the serum gamma glutamyl transpeptidase (GGT) is more than 600 IU/L, what is the most likely diagnosis?

A. Neonatal hepatitis
B. Choledochal cyst
C. Sclerosing cholangitis
D. Biliary atresia (Correct Answer)

Explanation: **Explanation:** In the evaluation of neonatal cholestasis, **Gamma-glutamyl transpeptidase (GGT)** is a critical biochemical marker. GGT is an enzyme found in the membranes of cells lining the biliary tract. Its elevation signifies biliary epithelial damage or obstruction. **1. Why Biliary Atresia (BA) is correct:** Biliary atresia is characterized by progressive fibro-inflammatory destruction of the extrahepatic bile ducts. This severe obstructive process leads to significant biliary epithelial injury, resulting in markedly elevated GGT levels. A serum GGT **>150–200 IU/L** is highly suggestive of BA, and levels **>600 IU/L** are classically associated with this condition, providing high specificity in differentiating it from other causes of neonatal jaundice. **2. Why other options are incorrect:** * **Neonatal Hepatitis:** This is a hepatocellular cause of cholestasis. While GGT can be elevated, it is typically much lower than in obstructive causes. Low or normal GGT in a cholestatic neonate should instead raise suspicion for **Byler’s disease (PFIC type 1 and 2)**. * **Choledochal Cyst:** While this is an obstructive pathology, the GGT levels are generally moderately elevated but rarely reach the extreme levels (>600 IU/L) seen in the acute inflammatory phase of Biliary Atresia. * **Sclerosing Cholangitis:** Neonatal primary sclerosing cholangitis is rare and usually presents with a more chronic, indolent course compared to the rapid, high-grade obstruction of BA. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis for BA:** Intraoperative Cholangiogram (IOCG). * **Best Screening Test:** Hepatobiliary Iminodiacetic Acid (HIDA) scan (shows absent excretion into the bowel). * **Kasai Procedure (Hepatoportoenterostomy):** Most successful if performed before **60 days** of life. * **Triangular Cord Sign:** A high-yield USG finding in Biliary Atresia representing fibrous tissue at the porta hepatis.

Question 16: A 6-year-old child presents with malignant hypertension. What is the drug of choice?

A. Sodium nitroprusside (Correct Answer)
B. Sublingual nifedipine
C. Furosemide
D. Enalapril

Explanation: **Explanation:** Malignant (or hypertensive) emergency in children is defined by severe hypertension associated with acute end-organ damage (e.g., encephalopathy, heart failure, or retinopathy). The primary goal is a controlled, rapid reduction of blood pressure using intravenous medications. **Why Sodium Nitroprusside is the Correct Answer:** **Sodium nitroprusside** is a potent, direct-acting vasodilator that acts on both arteries and veins. It is considered a drug of choice in hypertensive emergencies because of its **immediate onset of action** (seconds) and **short half-life** (minutes). This allows for precise, minute-to-minute titration of blood pressure, which is critical to avoid cerebral ischemia caused by an overly rapid drop in perfusion pressure. **Analysis of Incorrect Options:** * **Sublingual Nifedipine:** This is contraindicated in hypertensive emergencies. It can cause an unpredictable, precipitous drop in blood pressure, leading to reflex tachycardia and potentially fatal cerebral or myocardial ischemia. * **Furosemide:** While a potent loop diuretic, it is not the primary treatment for malignant hypertension unless the patient shows signs of fluid overload or pulmonary edema. * **Enalapril:** ACE inhibitors (especially IV Enalaprilat) have a longer duration of action and a less predictable response compared to nitroprusside, making them less ideal for the initial acute titration phase. **High-Yield Clinical Pearls for NEET-PG:** * **Rate of Reduction:** In hypertensive emergencies, reduce the Mean Arterial Pressure (MAP) by no more than **25% in the first 8 hours**, then gradually to the 95th percentile over the next 24–48 hours. * **Nitroprusside Toxicity:** Prolonged use or high doses can lead to **cyanide or thiocyanate toxicity**. Monitor blood pH and thiocyanate levels. * **Alternative:** **Labetalol (IV)** and **Nicardipine (IV)** are also frequently used first-line agents in pediatric hypertensive emergencies.

Question 17: Puberty is said to be delayed in girls if secondary sexual characteristics fail to appear by:

A. 10 years
B. 12 years
C. 13 years
D. 14 years (Correct Answer)

Explanation: **Explanation:** The onset of puberty is a highly regulated physiological process initiated by the activation of the Hypothalamic-Pituitary-Gonadal (HPG) axis. In girls, the first clinical sign of puberty is typically **Thelarche** (breast bud development). **1. Why 14 years is the correct answer:** According to standard pediatric guidelines (Nelson’s Textbook of Pediatrics), **Delayed Puberty** in girls is defined as the absence of secondary sexual characteristics (specifically breast development/Thelarche) by **13 to 14 years of age**, or if menarche has not occurred within 3 years of thelarche. While 13 years is often cited as the lower threshold for evaluation, **14 years** is the established clinical benchmark used in many standardized examinations (including NEET-PG) to signify a definitive delay requiring investigation. **2. Analysis of Incorrect Options:** * **A (10 years) & B (12 years):** These are within the normal range for pubertal onset. The average age for thelarche is approximately 10–11 years. * **C (13 years):** While 13 is the age at which clinicians begin to monitor for delay, 14 is the more definitive cut-off for the absence of any secondary characteristics in the context of this specific question. **3. High-Yield Clinical Pearls for NEET-PG:** * **Sequence of Puberty (Girls):** Thelarche (Breast) → Adrenarche/Pubarche (Hair) → Growth Spurt → Menarche (Menstruation). * **Delayed Puberty in Boys:** Defined as the absence of testicular enlargement (volume <4 ml) by **14 years**. * **Precocious Puberty:** Development of secondary sexual characteristics before **8 years** in girls and **9 years** in boys. * **Most Common Cause:** Constitutional Delay of Growth and Puberty (CDGP) is common, but one must rule out Turner Syndrome (45,XO) in girls with delayed puberty and short stature.

Question 18: A 5-year-old boy presented with massive hematemesis. He is not febrile. Per-abdominal examination revealed massive splenomegaly without hepatomegaly. What is the most probable diagnosis?

A. Non-cirrhotic portal fibrosis
B. Extrahepatic portal venous obstruction (Correct Answer)
C. Budd-Chiari syndrome
D. Hepatic carcinoma

Explanation: ### Explanation The clinical presentation of **massive hematemesis** associated with **isolated massive splenomegaly** (without hepatomegaly) in a young, non-febrile child is the classic hallmark of **Extrahepatic Portal Venous Obstruction (EPHVO)**. #### Why Option B is Correct: EPHVO is the most common cause of portal hypertension and upper GI bleeding in children. It typically results from portal vein thrombosis (often linked to neonatal umbilical sepsis or catheterization). Because the pathology is **pre-hepatic**, the liver remains healthy (no hepatomegaly or jaundice), but the resulting portal hypertension leads to: 1. **Congestive Splenomegaly:** Often massive. 2. **Esophageal Varices:** Leading to sudden, painless, massive hematemesis. #### Why the Other Options are Incorrect: * **A. Non-cirrhotic portal fibrosis (NCPF):** While it presents with portal hypertension and splenomegaly, it is primarily a disease of **young adults** (20–40 years) rather than 5-year-olds. * **C. Budd-Chiari Syndrome:** This involves hepatic venous outflow obstruction. It typically presents with a triad of **hepatomegaly**, ascites, and abdominal pain. The absence of hepatomegaly here makes it unlikely. * **D. Hepatic Carcinoma:** This would present with systemic symptoms (weight loss, anorexia), a hard/nodular **hepatomegaly**, and is extremely rare in this age group without underlying cirrhosis or hepatitis. #### High-Yield Clinical Pearls for NEET-PG: * **EPHVO Gold Standard Diagnosis:** Doppler Ultrasound (shows "Cavernous transformation of the portal vein" or **Portal Cavernoma**). * **Liver Function Tests (LFTs):** Usually **normal** in EPHVO because the liver parenchyma is unaffected. * **Management:** Endoscopic Variceal Ligation (EVL) or Sclerotherapy for acute bleeds; **Meso-rex shunt** is the surgical treatment of choice in children to restore physiological flow.

Question 19: What is the most common vasculitis seen in children?

A. Kawasaki disease
B. Takayasu disease
C. Henoch-Schonlein purpura (HSP) (Correct Answer)
D. Microscopic polyangiitis (PAN)

Explanation: **Explanation:** **Henoch-Schönlein Purpura (HSP)**, also known as IgA Vasculitis, is the **most common vasculitis in the pediatric population**. It is a small-vessel vasculitis characterized by the deposition of IgA-dominant immune complexes. It typically follows an upper respiratory tract infection and presents with the classic tetrad of palpable purpura (without thrombocytopenia), arthritis/arthralgia, abdominal pain, and renal involvement (hematuria). **Analysis of Options:** * **Kawasaki Disease (Option A):** This is the second most common vasculitis in children. It is a medium-vessel vasculitis and is the leading cause of acquired heart disease in children in developed countries due to its predilection for coronary artery aneurysms. * **Takayasu Disease (Option B):** A large-vessel vasculitis (aortoarteritis) that is much rarer in children. It is more commonly seen in adolescent females and young adults. * **Microscopic Polyangiitis/PAN (Option D):** Polyarteritis Nodosa (PAN) and microscopic polyangiitis are rare in the pediatric age group and usually present with more severe systemic involvement. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** HSP is primarily a clinical diagnosis. Platelet count is **normal** (distinguishing it from ITP). * **Biopsy:** If performed, skin biopsy shows **leukocytoclastic vasculitis** with IgA deposition. * **Prognosis:** Generally excellent; however, **renal involvement** (HSP nephritis) is the most important determinant of long-term morbidity. * **Intussusception:** HSP is a known lead point for **ileo-ileal** intussusception (unlike the typical idiopathic ileo-colic type).

Question 20: A short 4th metatarsal is seen in which of the following conditions?

A. Patau syndrome
B. Richards syndrome
C. Down's syndrome
D. Turner syndrome (Correct Answer)

Explanation: **Explanation:** The correct answer is **Turner Syndrome (45, XO)**. **1. Why Turner Syndrome is correct:** A short 4th metatarsal (and/or 4th metacarpal) is a classic skeletal manifestation of Turner syndrome, known as **Archibald’s sign**. This occurs due to premature epiphyseal fusion of the bones. When the patient makes a fist, the knuckle of the 4th digit appears recessed rather than prominent. This is a high-yield clinical marker used to differentiate Turner syndrome from other causes of primary amenorrhea. **2. Analysis of Incorrect Options:** * **Patau Syndrome (Trisomy 13):** Characterized by midline defects (holoprosencephaly, cleft lip/palate), polydactyly, and microphthalmia. It does not typically feature isolated shortening of the 4th metatarsal. * **Richards Syndrome:** A rare neurodegenerative disorder characterized by mental retardation, sensorineural hearing loss, and ketoaciduria. It is not associated with specific metatarsal shortening. * **Down’s Syndrome (Trisomy 21):** Common skeletal findings include clinodactyly (incurving of the 5th finger), a wide gap between the 1st and 2nd toes (sandal gap), and hypoplasia of the middle phalanx of the 5th digit, but not a short 4th metatarsal. **3. Clinical Pearls for NEET-PG:** * **Archibald’s Sign:** Shortening of the 4th metacarpal/metatarsal. * **Differential Diagnosis for Short 4th Metacarpal:** Turner syndrome, Pseudohypoparathyroidism (Albright Hereditary Osteodystrophy), and Pseudo-pseudohypoparathyroidism. * **Other Turner Skeletal Signs:** Cubitus valgus (increased carrying angle), Madelung deformity (wrist), and Shield chest (widely spaced nipples). * **Most Common Cardiac Defect:** Bicuspid aortic valve (most common overall); Coarctation of the aorta (classic association).

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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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