Endocrinology Practice Questions

Q: Which statin is indicated for an 8-year-old child diagnosed with heterozygous familial hypercholesterolemia?

Pravastatin. **Explanation:** The management of **Heterozygous Familial Hypercholesterolemia (HeFH)** in children focuses on lifestyle modifications followed by pharmacotherapy if LDL-C levels remain significantly elevated (typically >190 mg/dL or >160 mg/dL with a family history of early CVD). **Why Pravastatin is correct:** Pravastatin is unique because it is the only statin FDA-approved for use in children as young as **8 years old**. Most other statins are approved for children aged **10 years and older**. This makes Pravastatin the drug of choice when pharmacological intervention is required in the 8–10 year age bracket. **Analysis of Incorrect Options:** * **Simvastatin (A), Atorvastatin (C), and Lovastatin (D):** While these are commonly used to treat pediatric dyslipidemia, they are generally indicated for children **≥10 years of age**. Starting these medications in an 8-year-old would be considered "off-label" compared to the specific approval profile of Pravastatin. **High-Yield Clinical Pearls for NEET-PG:** * **Age of Initiation:** Statin therapy is generally not started before the age of 8 unless the child has **Homozygous** Familial Hypercholesterolemia (which requires much earlier, aggressive intervention). * **Monitoring:** Before starting statins, baseline Liver Function Tests (ALT/AST) and Creatine Kinase (CK) levels should be obtained. * **Teratogenicity:** Statins are **Category X**; adolescent females must be counseled on contraception. * **First-line:** Lifestyle and dietary changes (Step II AHA diet) should be trialed for 6–12 months before initiating drugs.

Q: Which of the following is NOT a known cause of precocious puberty?

Secondary hypothyroidism. **Explanation:** Precocious puberty is defined as the onset of secondary sexual characteristics before age 8 in girls and age 9 in boys. Understanding the hormonal axis is key to identifying its causes. **Why Secondary Hypothyroidism is the correct answer:** Secondary (central) hypothyroidism is characterized by a deficiency in TSH or TRH. This leads to low thyroid hormone levels without an increase in pituitary activity that could cross-react with gonadotropin receptors. It is associated with **delayed puberty**, not precocious puberty. **Analysis of Incorrect Options:** * **Primary Hypothyroidism:** This is a classic cause of "Van Wyk-Grumbach Syndrome." In severe primary hypothyroidism, extremely high levels of TSH (due to lack of feedback) can cross-react with FSH receptors because they share a common alpha-subunit. This leads to precocious puberty, often characterized by multicystic ovaries and vaginal bleeding in girls, or testicular enlargement in boys, without a bone age advancement. * **Congenital Adrenal Hyperplasia (CAH):** This causes **peripheral precocious puberty** (isosexual in boys, contrasexual in girls). Excess adrenal androgens lead to early development of pubic hair and phallic enlargement. * **Theca Cell Tumor:** These are ovarian tumors that secrete estrogen directly, leading to peripheral precocious puberty (isosexual) in girls, characterized by breast development and vaginal bleeding. **NEET-PG High-Yield Pearls:** * **Van Wyk-Grumbach Syndrome:** The triad of primary hypothyroidism, precocious puberty, and delayed bone age (unique, as most precocity advances bone age). * **True vs. Pseudo:** Central precocity (GnRH dependent) always involves early activation of the HPO axis; Peripheral precocity (GnRH independent) involves exogenous or ectopic sex steroids. * **McCune-Albright Syndrome:** Triad of polyostotic fibrous dysplasia, café-au-lait spots (Coast of Maine), and peripheral precocious puberty.

Q: Precocious puberty is seen in which of the following conditions?

All of the above. **Explanation:** Precocious puberty is defined as the onset of secondary sexual characteristics before age 8 in girls and age 9 in boys. It is broadly classified into **Central (GnRH-dependent)** and **Peripheral (GnRH-independent)** types. * **McCune-Albright Syndrome (MAS):** This is a classic cause of **Peripheral Precocious Puberty**. It is characterized by the triad of polyostotic fibrous dysplasia, café-au-lait spots (Coast of Maine borders), and autonomous endocrine overactivity (most commonly precocious puberty due to ovarian cysts in girls). It results from a somatic mutation in the *GNAS* gene. * **CNS Irradiation:** Low-dose cranial irradiation (often for leukemia or brain tumors) can trigger **Central Precocious Puberty**. It is thought to disrupt the inhibitory pathways that normally keep the GnRH pulse generator dormant during childhood, leading to premature activation of the Hypothalamic-Pituitary-Gonadal (HPG) axis. * **Hypothyroidism:** Severe, untreated primary hypothyroidism can cause **Van Wyk-Grumbach Syndrome**. High levels of TSH cross-react with FSH receptors (due to molecular mimicry), leading to precocious puberty, multicystic ovaries, and delayed bone age (unlike other forms of precocity where bone age is advanced). **Clinical Pearls for NEET-PG:** 1. **Bone Age:** In most precocious puberty, bone age is **advanced**. In Hypothyroidism-induced precocity, bone age is **delayed**. 2. **Treatment:** GnRH agonists (e.g., Leuprolide) are the treatment of choice for Central Precocious Puberty. 3. **Hamartoma:** Hypothalamic hamartoma is the most common organic cause of Central Precocious Puberty.

Q: An infant presents with failure to thrive and abdominal distension. His X-ray chest and abdomen showed findings suggestive of a diagnosis. What is the diagnosis?

Wolman disease. ***Wolman disease*** - **Pathognomonic bilateral adrenal calcification** on X-ray is the key diagnostic feature in an infant with failure to thrive and abdominal distension. - Caused by **lysosomal acid lipase deficiency**, leading to cholesteryl ester and triglyceride accumulation in multiple organs including adrenals. *Gaucher disease* - **No adrenal calcification** is seen on imaging, distinguishing it from Wolman disease. - Typically presents with **hepatosplenomegaly** and **bone pain** due to glucocerebroside accumulation, but without the characteristic calcifications. *Organic acidemia* - Presents with **metabolic acidosis** and characteristic urine organic acids, not radiological calcifications. - Clinical features include **vomiting**, **lethargy**, and **developmental delays**, but abdominal distension is less prominent. *Tyrosinemia* - Predominantly affects the **liver** with hepatomegaly and elevated liver enzymes, without adrenal calcification. - Associated with **renal tubular dysfunction** and characteristic **cabbage-like odor**, not the radiological findings described.

Q: Which of the following is NOT true about congenital hypothyroidism?

Females are more often affected. **Explanation:** Congenital Hypothyroidism (CH) is the most common preventable cause of intellectual disability worldwide. **Analysis of the Options:** * **Option A (Correct Answer):** This statement is actually **TRUE**, not false. In cases of thyroid dysgenesis (the most common cause of CH), there is a significant female preponderance, with a female-to-male ratio of approximately **2:1**. Since the question asks for the statement that is "NOT true," and all other options are technically accurate descriptions of the disease, this question likely contains a technical error in its framing or key. However, in the context of NEET-PG, **Option C** is the most medically "false" statement regarding the primary etiology of CH. * **Option B:** Most infants have **no signs at birth** because of the transplacental transfer of maternal T4, which protects the fetal brain. Clinical features (prolonged jaundice, large fontanelle, umbilical hernia) usually appear after a few weeks. * **Option C:** This is **FALSE**. CH is most commonly caused by **Thyroid Dysgenesis** (85% - ectopy, aplasia, or hypoplasia) or **Dysmorgonogenesis** (15%). Antibodies against thyroid peroxidase (TPO) are associated with Hashimoto’s thyroiditis (acquired), not congenital hypothyroidism. * **Option D:** The worldwide incidence is approximately **1:3000 to 1:4000** live births. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Thyroid Dysgenesis (specifically Ectopic thyroid). * **Most common cause of Goitrous CH:** Dyshormonogenesis (TPO defect). * **Screening:** Done at **48–72 hours** of life to avoid the physiological TSH surge. * **Treatment:** Levothyroxine (10–15 μg/kg/day) should be started immediately to prevent permanent neurodevelopmental delay. * **Radiology:** Absence of the **distal femoral epiphysis** at birth is a sign of intrauterine hypothyroidism.

Q: Late onset of puberty in the male is defined as:

Puberty onset after 16 years. **Explanation:** The definition of delayed puberty (Late onset of puberty) is based on the statistical upper limit of normal for the onset of secondary sexual characteristics. In males, puberty is considered delayed if there is **no evidence of testicular enlargement (volume < 4 ml or length < 2.5 cm) by the age of 14 years.** However, in the context of clinical milestones and specific academic definitions often tested in exams like NEET-PG, the **complete absence of any signs of puberty by age 16** is the definitive threshold for "Late onset." **Analysis of Options:** * **Option A (Correct):** By age 16, 99% of healthy males have entered puberty. Failure to do so indicates a pathological delay or a significant constitutional delay requiring investigation. * **Options B, C, and D:** These ages (17, 18, and 21) are well beyond the standard physiological window. While a patient might present at these ages, the clinical diagnosis of "delayed puberty" would have been established much earlier (at age 14 or 16). **High-Yield Clinical Pearls for NEET-PG:** * **First sign of puberty in males:** Testicular enlargement (due to growth of seminiferous tubules under FSH influence). * **Most common cause:** Constitutional Delay of Growth and Puberty (CDGP) – often associated with a positive family history and delayed bone age. * **Prader-Willi Syndrome:** A common syndromic cause of hypogonadotropic hypogonadism. * **Kallmann Syndrome:** Delayed puberty associated with anosmia (failure of GnRH neuron migration). * **Precocious Puberty (Male):** Onset of secondary sexual characters before **9 years** of age.

Q: Which of the following statements is not true about Turner's syndrome?

Hermaphroditism. **Explanation:** **Turner’s Syndrome (45, XO)** is a chromosomal disorder characterized by the complete or partial absence of one X chromosome in a phenotypic female. **Why "Hermaphroditism" is the correct answer (Not True):** Turner’s syndrome is a condition of **gonadal dysgenesis**, not hermaphroditism. In Turner’s, the ovaries fail to develop properly and are replaced by fibrous tissue (**streak ovaries**). True hermaphroditism (now termed Ovotesticular Disorder of Sexual Development) requires the presence of both ovarian and testicular tissue in the same individual, which is not a feature of Turner’s syndrome. **Analysis of Incorrect Options (True Statements):** * **No Mental Retardation:** Most individuals with Turner’s syndrome have **normal intelligence**. While they may face specific learning disabilities (e.g., visuospatial deficits), global intellectual disability is not a characteristic feature. * **Short Fourth Metacarpal:** Also known as **Archibald’s sign**, this is a classic skeletal finding in Turner’s syndrome. * **Gonadal Dysgenesis:** This is a hallmark of the condition. Accelerated oocyte atresia leads to streak ovaries, resulting in primary amenorrhea and lack of secondary sexual characteristics due to estrogen deficiency. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of primary amenorrhea.** * **Cardiac Associations:** Bicuspid aortic valve (most common), Coarctation of the aorta. * **Renal Association:** Horseshoe kidney. * **Physical Signs:** Webbed neck (pterygium colli), low posterior hairline, widely spaced nipples (shield chest), and lymphedema of hands/feet at birth. * **Gold Standard Diagnosis:** Karyotyping.

Question 1

Which statin is indicated for an 8-year-old child diagnosed with heterozygous familial hypercholesterolemia?

Accepted Answer

Pravastatin

Answer

Simvastatin

Answer

Atorvastatin

Answer

Lovastatin

Question 2

A 2-month-old infant presents with failure to thrive, recurrent emesis, hepatosplenomegaly, and adrenal insufficiency. Adrenal calcification is noted radiologically. What is the most probable diagnosis?

Accepted Answer

Wolman disease

Answer

Pheochromocytoma

Answer

Addison disease

Answer

Adrenal hypoplasia

Question 3

Which of the following is NOT a known cause of precocious puberty?

Accepted Answer

Secondary hypothyroidism

Answer

Primary hypothyroidism

Answer

Congenital adrenal hyperplasia

Answer

Theca cell tumor of the ovary

Question 4

Precocious puberty is seen in which of the following conditions?

Accepted Answer

All of the above

Answer

Hypothyroidism

Answer

CNS irradiation

Answer

McCune-Albright syndrome

Question 5

An infant presents with failure to thrive and abdominal distension. His X-ray chest and abdomen showed findings suggestive of a diagnosis. What is the diagnosis?

Accepted Answer

Wolman disease

Answer

Gaucher disease

Answer

Organic acidemia

Answer

Tyrosinemia

Question 6

Which of the following is NOT true about congenital hypothyroidism?

Accepted Answer

Females are more often affected

Answer

No signs at birth

Answer

Occurs due to antibodies against thyroid peroxisomes

Answer

Seen in 1:4000 live births

Question 7

A 2-week-old infant presents with feeding difficulties, somnolence, failure to thrive, and constipation. Blood studies reveal low T4 and high TSH. If appropriate therapy is not promptly instituted, which of the following complications would most likely occur?

Accepted Answer

Mental retardation

Answer

Bronchiectasis

Answer

Gigantism

Answer

Hepatic cirrhosis

Question 8

A cherry red spot is seen in which of the following conditions?

Accepted Answer

Tay-Sachs disease

Answer

Batten-Mayou disease

Answer

von Gierke's disease

Answer

Mucopolysaccharidosis

Question 9

Late onset of puberty in the male is defined as:

Accepted Answer

Puberty onset after 16 years

Answer

Puberty onset after 17 years

Answer

Puberty onset after 18 years

Answer

Puberty onset after 21 years

Question 10

Which of the following statements is not true about Turner's syndrome?

Accepted Answer

Hermaphroditism

Answer

No mental retardation

Answer

Short fourth metacarpal

Answer

Gonadal dysgenesis

Endocrinology — MCQs

Endocrinology — MCQs

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