Endocrinology Practice Questions

Q: All of the following are true for Turner syndrome except?

Height is more than 145 cm. **Explanation:** Turner Syndrome (45,XO) is the most common sex chromosomal abnormality in females. The correct answer is **Option A** because **short stature** is the most consistent clinical feature of Turner syndrome. Without growth hormone therapy, the average adult height is typically significantly **less than 145 cm** (usually around 140 cm). This growth failure is primarily attributed to the haploinsufficiency of the **SHOX gene** located on the X chromosome. **Analysis of other options:** * **Webbing of neck (Option B):** This is a classic dysmorphic feature (pterygium colli) resulting from the resolution of fetal cystic hygromas and lymphatic obstruction. * **Increased carrying angle (Option C):** Also known as **Cubitus valgus**, this is a characteristic skeletal finding where the forearm is angled away from the body to a greater degree than normal. * **Coarctation of aorta (Option D):** This is the most common specific obstructive cardiac lesion in Turner syndrome (seen in ~10-20% of cases). Bicuspid aortic valve is the most common overall cardiac anomaly. **High-Yield Clinical Pearls for NEET-PG:** * **Karyotype:** 45,XO is the most common, but mosaicism (45,X/46,XX) is frequent and may present with milder features. * **Gonads:** "Streak ovaries" lead to hypergonadotropic hypogonadism (primary amenorrhea, elevated FSH/LH). * **Renal:** Horseshoe kidney is the most common renal anomaly. * **Dermatoglyphics:** High ridge count on fingertips. * **Treatment:** Recombinant Growth Hormone (for height) and Estrogen replacement (for secondary sexual characteristics and bone health).

Q: What is the clinical manifestation of hypothyroidism in children?

Cretinism. **Explanation:** **1. Why Cretinism is Correct:** Cretinism is the term used for untreated **congenital hypothyroidism**. In children, thyroid hormones are critical for the development of the central nervous system and skeletal maturation. A deficiency during infancy leads to irreversible intellectual disability and stunted physical growth (short-statured "cretin"). Clinical features include a large protruding tongue, umbilical hernia, coarse facies, and delayed bone age. **2. Analysis of Incorrect Options:** * **B. Myxedema:** This refers to severe hypothyroidism in **adults**. It is characterized by non-pitting edema due to the accumulation of glycosaminoglycans in the dermis. While children can have "myxedematous" features, the specific clinical syndrome associated with childhood onset is Cretinism. * **C. Acromegaly:** This is caused by excessive Growth Hormone (GH) secretion **after** the closure of epiphyseal plates (adults), leading to the enlargement of hands, feet, and jaw. * **D. Gigantism:** This results from excessive GH secretion **before** the closure of epiphyseal plates in children, leading to proportional overgrowth of long bones and extreme height. **3. NEET-PG High-Yield Pearls:** * **Most Common Cause:** Worldwide, iodine deficiency is the most common cause; in developed areas/iodine-sufficient regions, **Thyroid Dysgenesis** (ectopy or aplasia) is the most common cause. * **Screening:** The best time for neonatal screening is **48–72 hours** after birth to avoid the physiological TSH surge. * **Early Sign:** Prolonged physiological jaundice is often the earliest clinical sign of neonatal hypothyroidism. * **Treatment:** Levothyroxine is the treatment of choice; initiating therapy before **2 weeks of age** is crucial to prevent permanent neurocognitive deficits.

Q: Precocious sexual development is characterized by breast and pubic hair growth before what age?

8 years. **Explanation:** Precocious puberty is defined as the onset of secondary sexual characteristics (thelarche or pubarche) at an age that is more than 2.5 standard deviations below the mean for the population. In females, the established clinical cutoff for precocious development is **8 years**. **1. Why 8 years is correct:** In girls, the first sign of puberty is typically thelarche (breast budding), followed by pubarche (pubic hair) and menarche. If these changes occur before the age of 8, it indicates premature activation of the Hypothalamic-Pituitary-Gonadal (HPG) axis (Central Precocious Puberty) or autonomous peripheral production of sex steroids (Peripheral Precocious Puberty). **2. Why the other options are incorrect:** * **9 years:** This is the age cutoff for precocious puberty in **males** (development of secondary sexual characteristics before age 9). * **10 and 11 years:** These ages fall within the normal physiological range for the onset of puberty in females. The average age for thelarche is approximately 10–10.5 years, and menarche typically occurs around 12–12.5 years. **NEET-PG High-Yield Pearls:** * **Sequence of Puberty (Girls):** Thelarche (Breast) → Pubarche (Hair) → Growth Spurt → Menarche (Bleeding). Remember the mnemonic: **"T-P-G-M"**. * **Central vs. Peripheral:** Central precocious puberty is "GnRH-dependent" and is most commonly **idiopathic** in girls. Peripheral is "GnRH-independent" (e.g., McCune-Albright Syndrome, Granulosa cell tumor). * **Investigation of Choice:** Bone age assessment (X-ray of the left hand/wrist) is the initial step to evaluate skeletal maturation. * **Treatment:** GnRH analogues (e.g., Leuprolide) are the gold standard for Central Precocious Puberty to prevent premature epiphyseal fusion and short adult stature.

Q: What is the most common endocrine abnormality observed in Down's syndrome?

Hypothyroidism. **Explanation:** **Hypothyroidism** is the most common endocrine disorder associated with Down’s syndrome (Trisomy 21). The prevalence is significantly higher than in the general population, affecting approximately 10–15% of individuals. The abnormality can manifest as **congenital hypothyroidism** (detected via newborn screening) or, more commonly, as **acquired autoimmune (Hashimoto’s) thyroiditis** later in childhood or adolescence. Additionally, many patients exhibit "compensated hypothyroidism" (elevated TSH with normal T4), necessitating regular thyroid function monitoring throughout their lives. **Analysis of Incorrect Options:** * **Hypoparathyroidism:** While Down’s syndrome is associated with various autoimmune conditions, primary hypoparathyroidism is not a characteristic feature. It is more classically associated with DiGeorge syndrome (22q11.2 deletion). * **Congenital Adrenal Hyperplasia (CAH):** This is a genetic enzymatic defect (most commonly 21-hydroxylase deficiency) and does not have an increased incidence specifically linked to Trisomy 21. * **Cushing’s Disease:** This results from an ACTH-secreting pituitary adenoma. There is no established epidemiological link between Down’s syndrome and an increased risk of Cushing’s disease. **High-Yield Clinical Pearls for NEET-PG:** * **Screening:** AAP guidelines recommend thyroid screening (TSH) at birth, 6 months, 12 months, and then **annually** for life in Down’s syndrome patients. * **Other Endocrine Links:** There is also an increased risk of **Type 1 Diabetes Mellitus** (autoimmune) in these patients. * **Non-Endocrine Associations:** Common associations include AVSD (most common cardiac defect), duodenal atresia, and early-onset Alzheimer’s disease.

Q: What is the first clinical sign of hypophosphatasia?

Premature loss of primary teeth. **Explanation:** **Hypophosphatasia (HPP)** is a rare genetic metabolic disorder caused by a deficiency of the **tissue-nonspecific alkaline phosphatase (TNSALP)** enzyme. This deficiency leads to an accumulation of inorganic pyrophosphate, which inhibits bone mineralization. **Why Option A is correct:** The **premature loss of primary (deciduous) teeth** (typically before age 5) is the most common and often the **first clinical sign** of the childhood and odontohypophosphatasia forms. This occurs due to the failure of **cementum** (the specialized bone-like substance covering the tooth root) to form correctly. Without cementum, the periodontal ligaments cannot attach the tooth to the alveolar bone, leading to painless exfoliation of teeth (most commonly the incisors) with the roots still intact. **Why other options are incorrect:** * **B. Bowed limb bones:** While rickets-like skeletal deformities (bowing) are a hallmark of HPP, they typically manifest after or alongside dental symptoms in the childhood form. * **C. Skull bone deficiency:** Severe hypomineralization of the skull (caput membranaceum) is characteristic of the **perinatal lethal form**, but in the more common clinical presentations, dental manifestations precede overt skeletal changes. * **D. All of the above:** While all are features of HPP, they do not all represent the *first* clinical sign. **High-Yield Clinical Pearls for NEET-PG:** * **Biochemical Marker:** Characterized by **low serum alkaline phosphatase (ALP)** levels (Note: Most other bone diseases have high ALP). * **Urinary Marker:** Elevated levels of **phosphoethanolamine** in the urine. * **Radiology:** "Copper beaten skull" appearance due to craniosynostosis and characteristic "metaphyseal lucencies" (tongues of radiolucency). * **Treatment:** Enzyme replacement therapy with **Asfotase alfa**.

Q: A five-year-old boy presents with coarse facial features, mental retardation, and dysostosis multiplex. Corneal clouding is absent. What is the diagnosis?

Hunter disease (MPS II). **Explanation:** The clinical presentation of coarse facial features, intellectual disability (mental retardation), and **dysostosis multiplex** (a constellation of skeletal abnormalities) is characteristic of **Mucopolysaccharidoses (MPS)**. **Why Hunter Disease (MPS II) is correct:** The defining clinical feature in this question is the **absence of corneal clouding**. While both Hurler (MPS I) and Hunter (MPS II) syndromes present with similar systemic features, Hunter syndrome is unique because it lacks corneal clouding. Furthermore, Hunter syndrome is the only MPS that follows an **X-linked recessive** inheritance pattern (all others are autosomal recessive). It is caused by a deficiency of the enzyme **Iduronate-2-sulfatase**. **Why the other options are incorrect:** * **Hurler Disease (MPS I-H):** This is the most severe form of MPS. While it presents with coarse features and dysostosis multiplex, **corneal clouding is a hallmark feature** and is usually present early in life. * **MPS Type IV (Morquio Syndrome):** Patients with Morquio syndrome have severe skeletal dysplasia and ligamentous laxity, but they typically have **normal intelligence** and do not have the "coarse" facial features seen in MPS I or II. * **Gaucher’s Disease:** This is a lipid storage disorder. While it involves hepatosplenomegaly and bone involvement (Erlenmeyer flask deformity), it does not present with coarse facies, dysostosis multiplex, or the specific mucopolysaccharide accumulation patterns. **High-Yield Clinical Pearls for NEET-PG:** 1. **Mnemonic:** "The **Hunter** needs clear eyes to aim at the **X**" (Hunter = No corneal clouding + X-linked recessive). 2. **Enzyme Deficiency:** Hunter = Iduronate-2-sulfatase; Hurler = Alpha-L-iduronidase. 3. **Dermal Sign:** "Pebbling" of the skin (scapular region) is a pathognomonic skin finding in Hunter syndrome.

Q: Which of the following is NOT true about Turner syndrome?

Subnormal intelligence quotient.. **Explanation:** **1. Why Option C is the correct answer (The "False" statement):** In Turner syndrome (45, XO), the **Intelligence Quotient (IQ) is typically within the normal range**. While patients may exhibit specific neurocognitive deficits—such as difficulties with visuospatial processing, non-verbal memory, and mathematics—their verbal intelligence and overall cognitive function are generally preserved. Therefore, labeling them as having "subnormal intelligence" or intellectual disability is clinically incorrect. **2. Analysis of Incorrect Options (True statements):** * **Option A:** If a Turner patient has mosaicism involving a Y chromosome (e.g., 45,X/46,XY), there is a significant risk (approx. 15-30%) of developing **gonadoblastoma**. In such cases, prophylactic gonadectomy is indicated. * **Option B:** Due to accelerated oocyte atresia, the ovaries are replaced by fibrous tissue, resulting in **bilateral streak gonads**. This leads to primary amenorrhea and lack of secondary sexual characteristics. * **Option D:** Because the streak gonads fail to produce estrogen and inhibin, there is a lack of negative feedback on the pituitary. This results in **Hypergonadotropic Hypogonadism**, characterized by elevated FSH and LH levels. **Clinical Pearls for NEET-PG:** * **Most common cardiac defect:** Bicuspid aortic valve (most common overall); Coarctation of aorta (classic association). * **Renal anomaly:** Horseshoe kidney. * **Dermatological sign:** Lymphedema of hands and feet at birth; webbed neck (cystic hygroma remnant). * **Short Stature:** Most consistent clinical finding; managed with recombinant Growth Hormone (GH). * **Karyotype:** 45, XO is the most common, but mosaicism (45,X/46,XX) is frequent.

Q: A 7-year-old boy is newly diagnosed with type 1 Diabetes mellitus and started on insulin therapy. When should screening for nephropathy begin in this child?

5 years after the onset of diabetes. ### Explanation The correct answer is **C. 5 years after the onset of diabetes.** **1. Why Option C is Correct:** In Type 1 Diabetes Mellitus (T1DM), diabetic nephropathy rarely develops before puberty or within the first few years of the disease. According to the International Society for Pediatric and Adolescent Diabetes (ISPAD) and ADA guidelines, screening for microalbuminuria (the earliest sign of nephropathy) should begin **5 years after the diagnosis** in children who are **at least 11 years old** or have reached **puberty**. Since this child is 7 years old, the metabolic insult requires time to manifest as structural renal damage. **2. Why Other Options are Incorrect:** * **Option A & B:** Unlike Type 2 Diabetes, where the exact onset is often unknown and complications may already be present at diagnosis, Type 1 has a clear clinical onset. Structural changes in the glomeruli take years of chronic hyperglycemia to develop; thus, screening immediately or at 1 year is not cost-effective and clinically unnecessary. * **Option D:** Waiting 10 years is dangerous, as significant, irreversible renal damage (macroalbuminuria) may occur by then. Early detection at 5 years allows for interventions like strict glycemic control and ACE inhibitors to slow progression. **3. High-Yield Clinical Pearls for NEET-PG:** * **Screening Tool:** The first sign is **Microalbuminuria** (30–300 mg/day or Albumin-to-Creatinine Ratio of 30–300 mg/g). * **Associated Screening:** * **Retinopathy:** Also begins 5 years after diagnosis (T1DM). * **Celiac & Thyroid Disease:** Screen **at the time of diagnosis** (autoimmune association). * **Hypertension:** Should be screened at **every clinical visit**. * **T2DM Exception:** In Type 2 Diabetes, screening for nephropathy begins **at the time of diagnosis**.

Q: What is the most common cause of precocious puberty?

Constitutional. **Explanation:** Precocious puberty is defined as the onset of secondary sexual characteristics before the age of 8 in girls and 9 in boys. It is broadly classified into **Central (GnRH-dependent)** and **Peripheral (GnRH-independent)** types. **Why Constitutional is correct:** The most common cause of precocious puberty overall is **Central Precocious Puberty (CPP)**. Within this category, the vast majority of cases (especially in girls, up to 90%) are **Idiopathic or Constitutional**. This represents an early but otherwise normal activation of the Hypothalamic-Pituitary-Gonadal (HPG) axis. While CNS tumors are a common cause of CPP in boys, the sheer frequency of idiopathic cases in girls makes "Constitutional" the most common cause overall. **Analysis of Incorrect Options:** * **McCune-Albright Syndrome:** This is a cause of *Peripheral* precocious puberty characterized by the triad of polyostotic fibrous dysplasia, café-au-lait spots, and autonomous endocrine overactivity. It is rare. * **Polycystic Ovary Syndrome (PCOS):** While PCOS involves hormonal imbalances (hyperandrogenism), it typically presents in late adolescence or adulthood with menstrual irregularities and hirsutism, not as a primary cause of precocious puberty. * **Kallmann Syndrome:** This is a cause of **Delayed Puberty** (hypogonadotropic hypogonadism) associated with anosmia, the exact opposite of precocious puberty. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** The GnRH stimulation test (CPP shows a pubertal LH response). * **Bone Age:** Characteristically advanced in all forms of true precocious puberty. * **Treatment of Choice (CPP):** Long-acting GnRH analogues (e.g., Leuprolide) to desensitize the pituitary and prevent premature epiphyseal fusion. * **Gender Difference:** CPP is more common in girls (usually idiopathic); in boys, CPP is more likely to have an underlying organic CNS lesion (e.g., hypothalamic hamartoma).

Question 1

All of the following are true for Turner syndrome except?

Accepted Answer

Height is more than 145 cm

Answer

Webbing of neck

Answer

Increased carrying angle

Answer

Coarctation of aorta may be seen

Question 2

What is the clinical manifestation of hypothyroidism in children?

Accepted Answer

Cretinism

Answer

Myxedema

Answer

Acromegaly

Answer

Gigantism

Question 3

Precocious sexual development is characterized by breast and pubic hair growth before what age?

Accepted Answer

8 years

Answer

9 years

Answer

10 years

Answer

11 years

Question 4

What is the most common endocrine abnormality observed in Down's syndrome?

Accepted Answer

Hypothyroidism

Answer

Hypoparathyroidism

Answer

Congenital adrenal hyperplasia

Answer

Cushing's disease

Question 5

What is the first clinical sign of hypophosphatasia?

Accepted Answer

Premature loss of primary teeth

Answer

Bowed limb bones

Answer

Skull bone deficiency

Answer

All of the above

Question 6

A 9-year-old female presents with a recent history of weight loss and vision problems. She is found to have low blood glucose and autoantibodies against P cells in her serum. What is the most likely diagnosis?

Accepted Answer

Juvenile-onset diabetes mellitus

Answer

Goodpasture syndrome

Answer

Graves' disease

Answer

Hashimoto disease

Question 7

A five-year-old boy presents with coarse facial features, mental retardation, and dysostosis multiplex. Corneal clouding is absent. What is the diagnosis?

Accepted Answer

Hunter disease (MPS II)

Answer

Mucopolysaccharidosis (MPS) Type IV

Answer

Hurler disease (MPS I-H)

Answer

Gaucher's disease

Question 8

Which of the following is NOT true about Turner syndrome?

Accepted Answer

Subnormal intelligence quotient.

Answer

Gonads have a high chance of developing gonadoblastoma if the karyotype is 45 XO/46XY.

Answer

Bilateral streak gonads.

Answer

FSH and LH levels are increased.

Question 9

A 7-year-old boy is newly diagnosed with type 1 Diabetes mellitus and started on insulin therapy. When should screening for nephropathy begin in this child?

Accepted Answer

5 years after the onset of diabetes

Answer

Immediately

Answer

1 year after the onset of diabetes

Answer

10 years after the onset of diabetes

Question 10

What is the most common cause of precocious puberty?

Accepted Answer

Constitutional

Answer

McCune-Albright syndrome

Answer

Polycystic Ovary Syndrome (PCOS)

Answer

Kallmann syndrome

Endocrinology — MCQs

Endocrinology — MCQs

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