Endocrinology Practice Questions

Q: Type 1 diabetes in children is most commonly associated with which of the following conditions?

Celiac disease. **Explanation:** Type 1 Diabetes Mellitus (T1DM) is an autoimmune condition characterized by the destruction of pancreatic beta cells. It is frequently associated with other organ-specific autoimmune disorders due to a shared genetic predisposition, specifically linked to **HLA-DR3 and HLA-DR4** genotypes. **Why Celiac Disease is the correct answer:** Celiac disease is the most common autoimmune comorbidity associated with T1DM, affecting approximately **5–10%** of pediatric patients. Both conditions share common genetic loci (HLA-DQ2 and DQ8). Because many children with T1DM are asymptomatic for Celiac disease, clinical guidelines recommend routine screening using **Tissue Transglutaminase (tTG) IgA antibodies** at the time of T1DM diagnosis and periodically thereafter. **Analysis of Incorrect Options:** * **A. Obesity:** This is strongly associated with **Type 2 Diabetes**, not Type 1. T1DM typically presents with weight loss and a lean habitus. * **C. Down Syndrome:** While children with Down syndrome have an increased risk of autoimmune issues (including T1DM), the association is not as frequent or specific as the link between T1DM and Celiac disease. * **D. Hypothyroidism:** Autoimmune thyroiditis (Hashimoto’s) is the *second* most common autoimmune association in T1DM. While highly relevant, Celiac disease is often cited as the primary screening priority in pediatric T1DM protocols. **Clinical Pearls for NEET-PG:** * **Screening Rule:** Always screen T1DM patients for Celiac disease and Hypothyroidism (TSH/Anti-TPO). * **Genetic Markers:** HLA-DR3/DR4 (T1DM), HLA-DQ2/DQ8 (Celiac). * **Mauriac Syndrome:** A rare complication of poorly controlled T1DM characterized by growth failure, delayed puberty, and hepatomegaly. * **Diagnosis:** HbA1c ≥ 6.5% or Fasting Plasma Glucose ≥ 126 mg/dL.

Q: What is the eponymus Trisomy 18?

Edward's syndrome. ### Explanation **Correct Option: D. Edward's syndrome** Edward’s syndrome is caused by **Trisomy 18** (47, XX/XY, +18). It is the second most common autosomal trisomy among live births after Down’s syndrome. The condition is characterized by severe intellectual disability and multi-system defects. The extra chromosome 18 usually results from a meiotic non-disjunction event, most commonly during maternal meiosis. **Analysis of Incorrect Options:** * **A. Cri du chat syndrome:** This is not a trisomy but a structural chromosomal abnormality involving a **partial deletion of the short arm of chromosome 5 (5p-)**. It is characterized by a high-pitched, cat-like cry. * **B. Patau's syndrome:** This refers to **Trisomy 13**. Clinical hallmarks include midline defects such as holoprosencephaly, cleft lip/palate, and polydactyly. * **C. Down's syndrome:** This refers to **Trisomy 21**, the most common viable autosomal trisomy. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad of Edward’s Syndrome:** Micrognathia (small jaw), Clenched fists with **overlapping fingers** (2nd and 5th fingers over 3rd and 4th), and **Rocker-bottom feet** (also seen in Trisomy 13). * **Cardiac Defects:** Ventricular Septal Defect (VSD) is the most common. * **Other Features:** Low-set "faun-like" ears, prominent occiput, and Horseshoe kidney. * **Screening:** On a Quadruple screen, Trisomy 18 typically shows **decreased levels of all markers** (AFP, hCG, uE3, and Inhibin A), unlike Down’s syndrome where hCG and Inhibin A are elevated.

Q: Common features of acquired hypothyroidism include all EXCEPT:

Mental retardation. **Explanation:** The key to answering this question lies in understanding the **timing of brain development**. Thyroid hormones are critical for neurogenesis and myelination primarily during the first 2–3 years of life. * **Why B is correct:** In **acquired hypothyroidism** (onset after the age of 2–3 years), the brain is already structurally developed. Therefore, while these children may experience sluggishness, poor concentration, or declining school performance, they **do not develop permanent mental retardation**. Permanent intellectual disability is a hallmark of *congenital* hypothyroidism (Cretinism) if not treated early. * **Why A is incorrect:** Growth retardation is the most common clinical manifestation of acquired hypothyroidism. There is a marked decrease in growth velocity, often leading to short stature with delayed bone age. * **Why C is incorrect:** Hypothyroidism typically causes **delayed puberty**. However, in rare, severe cases, it can cause *Van Wyk-Grumbach syndrome*, characterized by precocious puberty due to high TSH levels cross-reacting with FSH receptors. * **Why D is incorrect:** This refers to **Kocher-Debre-Semelaigne syndrome**, where children with long-standing hypothyroidism develop generalized muscular "pseudohypertrophy" (especially in the calves), giving them a Herculean appearance. **NEET-PG High-Yield Pearls:** 1. **Most common cause** of acquired hypothyroidism worldwide: Hashimoto’s Thyroiditis. 2. **First clinical sign:** Deceleration of linear growth. 3. **Bone Age:** Characteristically delayed in hypothyroidism, unlike in genetic short stature. 4. **Dental Age:** Also delayed (delayed eruption of permanent teeth).

Q: Pheochromocytoma is a tumor of which gland or structure?

Adrenal medulla. **Explanation:** **Pheochromocytoma** is a catecholamine-secreting tumor derived from the **chromaffin cells** of the embryonic neural crest. The primary site for these cells is the **Adrenal Medulla** (Option B), which accounts for approximately 85–90% of cases. These tumors produce excess epinephrine, norepinephrine, and dopamine, leading to the classic clinical triad of episodic headache, sweating, and tachycardia. **Why other options are incorrect:** * **Pituitary Gland (A):** The pituitary consists of the adenohypophysis and neurohypophysis; tumors here (like prolactinomas) secrete hormones like GH, ACTH, or Prolactin, not catecholamines. * **Pancreas (C):** Pancreatic neuroendocrine tumors (e.g., Insulinoma, Gastrinoma) arise from islet cells. While they are part of the MEN 1 syndrome, they are unrelated to pheochromocytoma. * **Adrenal Cortex (D):** The cortex is of mesodermal origin and produces steroid hormones (cortisol, aldosterone, androgens). Tumors here lead to Cushing’s syndrome or Conn’s syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of 10s:** 10% are bilateral, 10% are malignant, 10% are extra-adrenal (called **Paragangliomas**), and 10% occur in children. * **Associated Syndromes:** MEN 2A and 2B, von Hippel-Lindau (VHL) disease, and Neurofibromatosis type 1 (NF1). * **Diagnosis:** Best initial screening test is **urinary or plasma fractionated metanephrines**. * **Management:** Pre-operative stabilization requires **Alpha-blockade first** (e.g., Phenoxybenzamine) followed by Beta-blockade to prevent a hypertensive crisis.

Q: An 11-year-old patient with type 1 diabetes mellitus was on continuous subcutaneous insulin infusion (CSII). During a holiday, she became disoriented. On admission, her laboratory values were: Sodium = 126 mEq/dL, Potassium = 4.3 mEq/dL, BUN = 100 mg/dL, Bicarbonate = 10 mEq/dL, and Blood Sugar = 600 mg%. Which of the following is NOT required for management?

3% saline. The patient presents with classic features of **Diabetic Ketoacidosis (DKA)**: hyperglycemia (600 mg%), metabolic acidosis (Bicarbonate 10 mEq/dL), and disorientation. The hyponatremia (126 mEq/dL) in this context is **"Dilutional Hyponatremia"** (Pseudohyponatremia) caused by the osmotic effect of high glucose pulling water into the extracellular space. ### Why 3% Saline is NOT required (Correct Option) In DKA, the sodium deficit is corrected by standard fluid resuscitation (usually 0.9% Normal Saline). **3% Saline (Hypertonic Saline)** is contraindicated because: 1. The hyponatremia is not absolute; for every 100 mg/dL rise in glucose above normal, the measured sodium drops by approximately 1.6 mEq/L. 2. Rapid correction of sodium in DKA increases the risk of **Cerebral Edema**, the leading cause of mortality in pediatric DKA. ### Explanation of Other Options * **A. Arterial Blood Gas (ABG):** Essential to assess the severity of acidosis (pH and Anion Gap) and monitor the response to treatment. * **B. Potassium hydrogen phosphate:** In DKA, phosphate is lost through osmotic diuresis. If levels drop significantly, replacement (often as potassium phosphate) is needed to prevent 2,3-DPG depletion and respiratory muscle weakness. * **C. Intravenous potassium:** Even if serum potassium appears normal (4.3 mEq/dL), there is a total body potassium deficit. Once insulin therapy starts, potassium shifts intracellularly, necessitating early replacement to prevent life-threatening hypokalemia. ### Clinical Pearls for NEET-PG * **Corrected Sodium Formula:** Measured Na + [1.6 × (Glucose - 100) / 100]. * **Insulin Dosing:** In pediatric DKA, start insulin infusion at **0.1 U/kg/hour** only *after* initial fluid bolus. * **Cerebral Edema Warning:** Sudden headache, bradycardia, or neurological deterioration during DKA treatment suggests cerebral edema; treat immediately with **Mannitol**, not fluid restriction.

Q: 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 likely diagnosis?

Wolman's disease. **Explanation:** **Wolman’s Disease** is the correct diagnosis. It is an autosomal recessive lysosomal storage disorder caused by a deficiency of the enzyme **Lysosomal Acid Lipase (LAL)**. This deficiency leads to the massive accumulation of cholesteryl esters and triglycerides in various organs. * **Clinical Presentation:** The classic triad includes failure to thrive (due to malabsorption), hepatosplenomegaly, and progressive adrenal insufficiency. * **Pathognomonic Sign:** Bilateral, enlarged, and **calcified adrenal glands** are the hallmark radiological finding in Wolman’s disease, occurring in approximately 90% of cases. **Analysis of Incorrect Options:** * **A. Adrenal Hemorrhage:** While it can cause adrenal calcification (usually as a late sequela) and insufficiency, it typically presents acutely in the neonatal period (e.g., birth trauma or sepsis) rather than as a progressive storage disorder with hepatosplenomegaly. * **C. Pheochromocytoma:** This is a catecholamine-secreting tumor. It is extremely rare in infants and presents with hypertension and tachycardia, not failure to thrive or adrenal insufficiency. * **D. Addison’s Disease:** This is a general term for primary adrenal insufficiency. While it explains the electrolyte imbalances, it does not account for the hepatosplenomegaly or the specific finding of adrenal calcification in an infant. **High-Yield Pearls for NEET-PG:** * **Enzyme Defect:** Lysosomal Acid Lipase (LAL). * **Cholesteryl Ester Storage Disease (CESD):** A milder, late-onset variant of LAL deficiency (Wolman is the severe, infantile form). * **Radiology:** "Snowstorm" appearance of the adrenals on X-ray/CT due to diffuse punctate calcifications. * **Prognosis:** Without enzyme replacement therapy (Sebelipase alfa), Wolman’s disease is usually fatal within the first year of life.

Q: A child presents with decreased serum calcium, increased serum phosphorus, and decreased urinary calcium and phosphorus. Which condition is most likely?

Chronic renal failure. **Explanation:** The biochemical profile of **decreased serum calcium**, **increased serum phosphorus**, and **decreased urinary excretion** of both is characteristic of **Chronic Renal Failure (CRF)**. In CRF, the kidneys cannot effectively excrete phosphorus, leading to **hyperphosphatemia**. High phosphorus levels directly complex with calcium and inhibit the enzyme 1-alpha-hydroxylase, leading to a deficiency of active Vitamin D (Calcitriol). This results in decreased intestinal calcium absorption (**hypocalcemia**). Because the Glomerular Filtration Rate (GFR) is severely reduced, the total filtered load of both calcium and phosphorus into the urine is significantly decreased, explaining the low urinary levels. **Analysis of Incorrect Options:** * **Renal Tubular Acidosis (RTA):** Typically presents with hypercalciuria (increased urinary calcium) due to the buffering of metabolic acidosis by bone, which releases calcium into the urine. * **Nutritional & Coeliac Rickets:** Both are forms of Vitamin D deficiency. While they present with low serum calcium, they characteristically show **low or normal serum phosphorus** (due to secondary hyperparathyroidism causing phosphaturia) and **increased** urinary phosphorus. **High-Yield Pearls for NEET-PG:** * **Secondary Hyperparathyroidism:** In CRF, hypocalcemia and hyperphosphatemia trigger a massive rise in PTH to normalize calcium at the expense of bone (Renal Osteodystrophy). * **FGF-23:** This hormone rises early in CRF to help excrete phosphorus, but eventually fails as GFR declines. * **Rule of Thumb:** If Phosphorus is **High**, think Renal Failure or Hypoparathyroidism. If Phosphorus is **Low**, think Rickets or PHP.

Q: Screening of neonatal thyroid disease is done by?

TSH. **Explanation:** **Congenital Hypothyroidism (CH)** is one of the most common preventable causes of intellectual disability. Screening is essential because most affected newborns appear clinically normal at birth due to the protective effect of maternal thyroxine. **Why TSH is the Correct Answer:** In most global screening programs, including those in India, **TSH (Thyroid Stimulating Hormone)** is the preferred primary screening tool. 1. **Sensitivity:** TSH is highly sensitive for detecting **Primary Congenital Hypothyroidism** (the cause in >95% of cases), as even a slight drop in T4 leads to a significant compensatory rise in TSH. 2. **Cost-effectiveness:** It is easier to standardize and more cost-effective than measuring free T4. 3. **Timing:** Samples are ideally collected via heel prick (Guthrie card) between **48–72 hours of life** to avoid the physiological "TSH surge" that occurs immediately after birth. **Why Other Options are Incorrect:** * **T4:** While some programs use a "Primary T4 with reflex TSH" approach, T4 alone misses cases of mild primary hypothyroidism where T4 is low-normal but TSH is elevated. * **T3:** T3 levels often remain normal until late stages of hypothyroidism and are never used for screening. * **TPO Antibodies:** These are markers for autoimmune thyroiditis (e.g., Hashimoto’s), which is an acquired condition and not a cause of congenital hypothyroidism. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of CH:** Thyroid Dysgenesis (Ectopy is the most common specific type). * **Most common cause of Goitrous CH:** Dyshormonogenesis (Thyroid Peroxidase deficiency). * **Clinical Sign:** A large posterior fontanelle (>0.5 cm) at birth is an early suspicious sign. * **Treatment:** Levothyroxine (10–15 μg/kg/day) should be started immediately to prevent permanent neurocognitive impairment.

Question 1

Type 1 diabetes in children is most commonly associated with which of the following conditions?

Accepted Answer

Celiac disease

Answer

Obesity

Answer

Down syndrome

Answer

Hypothyroidism

Question 2

What is the eponymus Trisomy 18?

Accepted Answer

Edward's syndrome

Answer

Cri du chat syndrome

Answer

Patau's syndrome

Answer

Down's syndrome

Question 3

Common features of acquired hypothyroidism include all EXCEPT:

Accepted Answer

Mental retardation

Answer

Growth retardation

Answer

Delayed puberty

Answer

Pseudohypertrophy of muscles

Question 4

Pheochromocytoma is a tumor of which gland or structure?

Accepted Answer

Adrenal medulla

Answer

Pituitary gland

Answer

Pancreas

Answer

Adrenal cortex

Question 5

An 11-year-old patient with type 1 diabetes mellitus was on continuous subcutaneous insulin infusion (CSII). During a holiday, she became disoriented. On admission, her laboratory values were: Sodium = 126 mEq/dL, Potassium = 4.3 mEq/dL, BUN = 100 mg/dL, Bicarbonate = 10 mEq/dL, and Blood Sugar = 600 mg%. Which of the following is NOT required for management?

Accepted Answer

3% saline

Answer

Arterial Blood Gas (ABG)

Answer

Potassium hydrogen phosphate

Answer

Intravenous potassium

Question 6

True precocious puberty can occur in all of the following conditions, except?

Accepted Answer

Congenital adrenal hyperplasia

Answer

McCune Albright syndrome

Answer

Craniopharyngioma

Answer

Hypothalamic hamartoma

Question 7

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 likely diagnosis?

Accepted Answer

Wolman's disease

Answer

Adrenal hemorrhage

Answer

Pheochromocytoma

Answer

Addison's disease

Question 8

A child presents with decreased serum calcium, increased serum phosphorus, and decreased urinary calcium and phosphorus. Which condition is most likely?

Accepted Answer

Chronic renal failure

Answer

Renal tubular acidosis

Answer

Nutritional rickets

Answer

Coeliac rickets

Question 9

A 2-week-old baby presents with scrotal pigmentation, hyponatremia, hypoglycemia, and hyperkalemia. Which enzyme deficiency is most likely responsible?

Accepted Answer

21 alpha hydroxylase

Answer

11 beta hydroxylase

Answer

3 beta hydroxylase dehydrogenase

Answer

17 alpha hydroxylase

Question 10

Screening of neonatal thyroid disease is done by?

Accepted Answer

TSH

Answer

T4

Answer

T3

Answer

TPO antibodies

Endocrinology — MCQs

Endocrinology — MCQs

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