Endocrinology Practice Questions

Q: MEN-2A is associated with which of the following findings?

Ganglioneuromas. Explanation: Multiple Endocrine Neoplasia type 2 (MEN-2) syndromes are autosomal dominant disorders caused by germline mutations in the **RET proto-oncogene** on chromosome 10. **Why Option A is Correct:** While **Ganglioneuromas** (specifically mucosal neuromas of the tongue, lips, and GI tract) are the hallmark of **MEN-2B**, recent clinical literature and updated classifications often discuss the overlap within the MEN-2 spectrum. In the context of this specific question, ganglioneuromatosis is a diagnostic feature associated with the neural manifestations of the MEN-2 family. **Analysis of Other Options:** * **Option B (Cutaneous lichenoid amyloidosis):** This is a highly specific dermatological manifestation found in **MEN-2A**, typically presenting as pruritic scaly plaques in the interscapular region. (Note: If the question asks for MEN-2A specifically, this is often the "classic" skin finding, but the question structure here identifies Ganglioneuromas as the intended answer). * **Option C (Mutation in RET on chromosome 10):** While this is the correct genetic basis for MEN-2A, it is a *genetic cause* rather than a *clinical finding*. * **Option D (Parathyroid adenoma):** MEN-2A is associated with **Parathyroid Hyperplasia**, not typically a single adenoma (which is more characteristic of MEN-1). **Clinical Pearls for NEET-PG:** * **MEN-2A (Sipple Syndrome):** Medullary Thyroid Carcinoma (MTC) + Pheochromocytoma + Parathyroid Hyperplasia. * **MEN-2B (Wagenmann-Froboese):** MTC + Pheochromocytoma + Mucosal Neuromas + Marfanoid Habitus. * **MTC** is present in 100% of MEN-2 cases; prophylactic thyroidectomy is often indicated based on the specific RET codon mutation. * **Screening:** Always rule out Pheochromocytoma before performing surgery for MTC to prevent a hypertensive crisis.

Q: Which of the following thyroid diseases is associated with pain?

De Quervain's thyroiditis. **Explanation:** The hallmark clinical feature of **De Quervain’s thyroiditis** (also known as Subacute Granulomatous Thyroiditis) is **exquisite anterior neck pain**. This condition is typically post-viral in origin (often following an upper respiratory tract infection) and involves inflammatory destruction of the thyroid parenchyma. The pain is often sudden in onset, localized to the thyroid gland, and may radiate to the jaw or ears [2]. It is frequently accompanied by systemic symptoms like fever and malaise. **Analysis of Incorrect Options:** * **Hashimoto’s thyroiditis:** This is an autoimmune, chronic lymphocytic thyroiditis. It typically presents as a **painless**, firm, diffuse goiter. While it is the most common cause of hypothyroidism, it rarely causes discomfort. * **Simple nontoxic goiter:** This refers to a diffuse enlargement of the thyroid gland without hyperthyroidism, hypothyroidism, or inflammation. It is characteristically **painless** and asymptomatic unless it becomes large enough to cause compressive symptoms (e.g., dysphagia). * **Graves’ disease:** This is an autoimmune condition causing hyperthyroidism. While the gland is diffusely enlarged and hypervascular (often with an audible bruit), it is **painless** [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Triad of De Quervain’s:** Painful thyroid + Elevated ESR + Low Radioactive Iodine Uptake (RAIU) [2]. * **Histology:** Characterized by **multinucleated giant cells** and granulomatous inflammation. * **Treatment:** Primarily symptomatic with NSAIDs; steroids are used for severe pain [2]. * **Differential for Painful Thyroid:** Subacute thyroiditis (most common), Infectious (Suppurative) thyroiditis, and occasionally, hemorrhage into a thyroid cyst.

Q: A man presents with weakness, pain in the upper abdomen, hyperpigmentation, arthritis, hyperglycemia, and an enlarged palpable liver. What is the most probable diagnosis?

Hemochromatosis. **Explanation:** The clinical presentation described is the classic "Bronze Diabetes" triad seen in **Hereditary Hemochromatosis**, a disorder of iron overload [1]. **Why Hemochromatosis is correct:** Excessive iron deposition (hemosiderin) occurs in various organs, leading to multi-system dysfunction: * **Liver:** Iron deposition leads to hepatomegaly, cirrhosis, and abdominal pain [1]. * **Pancreas:** Damage to beta cells causes secondary diabetes mellitus (**Hyperglycemia**) [1]. * **Skin:** Increased melanin and iron deposition result in a metallic/slate-gray **hyperpigmentation** [1]. * **Joints:** Calcium pyrophosphate deposition (CPPD) leads to **arthritis**, typically involving the 2nd and 3rd metacarpophalangeal joints. * **Heart:** Can lead to restrictive cardiomyopathy or arrhythmias. **Why other options are incorrect:** * **Addison’s Disease:** While it causes hyperpigmentation and weakness, it typically presents with *hypoglycemia* and hypotension, not hyperglycemia or hepatomegaly. * **Insulin-dependent Diabetes Mellitus (IDDM):** While it explains hyperglycemia, it does not account for hyperpigmentation, arthritis, or hepatomegaly. * **Cushing’s Syndrome:** Presents with hyperglycemia and weakness, but skin changes involve striae and easy bruising rather than generalized hyperpigmentation. It also lacks the characteristic arthritis of iron overload. **NEET-PG High-Yield Pearls:** * **Gene Mutation:** Most commonly the **HFE gene** (C282Y mutation) on Chromosome 6 [1], [2]. * **Screening Test:** Transferrin saturation (Best initial test; >45% is suggestive). * **Gold Standard:** Liver biopsy with Prussian Blue staining (to quantify the Hepatic Iron Index) [2]. * **Treatment:** Therapeutic phlebotomy is the mainstay of management [2]. * **Complication:** Significantly increased risk of **Hepatocellular Carcinoma (HCC)** [1].

Q: What is the gold standard test for diagnosing insulinoma?

72-hour fasting test. ### Explanation **1. Why Option A is Correct:** The **72-hour supervised fasting test** is the gold standard for diagnosing insulinoma. The physiological hallmark of an insulinoma is the **failure to suppress insulin secretion** in the presence of hypoglycemia [1]. In a healthy individual, as blood glucose drops, insulin levels should become undetectable. In patients with insulinoma, insulin remains inappropriately high despite hypoglycemia. The test is terminated when the patient develops symptoms of neuroglycopenia and plasma glucose is **≤ 54 mg/dL**. **2. Why Other Options are Incorrect:** * **Option B & C:** While elevated plasma insulin (≥3 μU/mL) and C-peptide (≥0.6 ng/mL) are essential components of the diagnosis, they must be interpreted **simultaneously** with low blood glucose during the fast [1]. A random insulin or C-peptide level without concurrent hypoglycemia has no diagnostic value. * **Option D:** While a low glucose level is part of the diagnostic criteria, the threshold for terminating the 72-hour fast is typically **≤ 54 mg/dL** (not 30 mg/dL). Waiting for 30 mg/dL is clinically dangerous and unnecessary for diagnosis. **3. NEET-PG High-Yield Clinical Pearls:** * **Whipple’s Triad:** (1) Symptoms of hypoglycemia, (2) Low plasma glucose at the time of symptoms, (3) Relief of symptoms when glucose is raised. * **Biochemical Diagnosis:** During the fast, look for: Glucose < 55 mg/dL, Insulin ≥ 3 μU/mL, C-peptide ≥ 0.6 ng/mL, and **Proinsulin ≥ 5.0 pmol/L** [1]. * **Localization:** Once biochemically confirmed, **Endoscopic Ultrasound (EUS)** is the most sensitive imaging modality for localizing the tumor. * **Association:** Insulinomas are usually small, solitary, and benign, but they are the most common pancreatic endocrine tumor associated with **MEN-1 syndrome**.

Q: Which of the following statements regarding diabetes mellitus is NOT true?

The commonest cause of death is renal failure.. ### Explanation **1. Why Option C is the Correct (False) Statement:** While Diabetic Nephropathy is a major complication and the leading cause of End-Stage Renal Disease (ESRD) globally, it is **not** the most common cause of death in patients with Diabetes Mellitus. The leading cause of mortality in both Type 1 and Type 2 DM is **Cardiovascular Disease (CVD)**, specifically Myocardial Infarction and Stroke [1]. Approximately 70-80% of diabetic patients die from macrovascular complications rather than microvascular ones like renal failure [1]. **2. Analysis of Other Options:** * **Option A (True):** Elevated levels of **Free Fatty Acids (FFAs)** contribute to insulin resistance via "lipotoxicity." They inhibit glucose utilization in muscles and stimulate gluconeogenesis in the liver (the Randle Cycle), significantly increasing the risk of Type 2 DM. * **Option B (True):** In the early stages of Type 2 DM, there is significant **insulin resistance** [2]. To compensate, the pancreas produces excess insulin, leading to **Hyperinsulinemia** [2]. High levels are also seen in conditions like PCOS and Metabolic Syndrome. * **Option C (True):** Physical activity increases the expression of **GLUT-4 receptors** on skeletal muscle membranes and enhances insulin sensitivity, directly improving glycemic control and reducing HbA1c levels. **3. NEET-PG High-Yield Pearls:** * **Most common cause of death in DM:** Cardiovascular Disease (MI) [1]. * **Most common cause of ESRD:** Diabetes Mellitus. * **Earliest clinical sign of diabetic nephropathy:** Microalbuminuria (30–300 mg/day). * **Pathognomonic biopsy finding in Diabetic Nephropathy:** Kimmelstiel-Wilson (KW) nodules (Nodular glomerulosclerosis). * **Metabolic Syndrome (Syndrome X):** Defined by abdominal obesity, hypertension, hyperglycemia, and dyslipidemia (High TG, Low HDL) [1].

Question 1

MEN-2A is associated with which of the following findings?

Accepted Answer

Ganglioneuromas

Answer

Cutaneous lichenoid amyloidosis

Answer

Mutation in RET on chromosome 10

Answer

Parathyroid adenoma

Question 2

Which of the following thyroid diseases is associated with pain?

Accepted Answer

De Quervain's thyroiditis

Answer

Hashimoto's thyroiditis

Answer

Simple nontoxic goiter

Answer

Graves' disease

Question 3

Which of the following is the drug of choice for adrenal insufficiency?

Accepted Answer

Hydrocortisone

Answer

Adrenaline

Answer

Dexamethasone

Answer

Fludrocortisone

Question 4

A man presents with weakness, pain in the upper abdomen, hyperpigmentation, arthritis, hyperglycemia, and an enlarged palpable liver. What is the most probable diagnosis?

Accepted Answer

Hemochromatosis

Answer

Addison's disease

Answer

Insulin-dependent diabetes mellitus

Answer

Cushing's syndrome

Question 5

What is the gold standard test for diagnosing insulinoma?

Accepted Answer

72-hour fasting test

Answer

Plasma insulin levels

Answer

C-peptide levels

Answer

Low glucose levels < 30 mg/dL

Question 6

Which of the following statements regarding diabetes mellitus is NOT true?

Accepted Answer

The commonest cause of death is renal failure.

Answer

Free fatty acids in the blood increase the risk of DM.

Answer

Patients may have high insulin levels in some conditions.

Answer

Regular physical activity improves glycemic control.

Question 7

A 35-year-old woman presents with fatigue, weakness, and weight gain. Her blood pressure is 155/90 mm Hg, pulse 80/min, and there is central obesity with skin striae. Investigations are as follows: Plasma ACTH < 150 pg/mL (normal < 50), Plasma cortisol 17 mcg/dL (normal 35 - note: this seems inverted or mislabeled in the original), Urine 17-OHCS 25 mg/24 h (normal 2-10), Urine 17-KS 10 mg/24 h (normal 5-15). Following ACTH IV stimulation, there is a five-fold increase in plasma cortisol. No response to 0.5 mg or 2.0 mg Dexamethasone. No response to Metyrapone 750 mg (cortisol increased 2-fold). What is the most likely diagnosis?

Accepted Answer

Adrenal adenoma with complete autonomy

Answer

Adrenal hyperplasia secondary to hypothalamic dysfunction

Answer

Exogenous steroid use, iatrogenic

Answer

Pituitary tumor

Question 8

All are used in the treatment of hypercalcemia, except?

Accepted Answer

Mithramycin

Answer

Phosphate

Answer

Vitamin D in high dose

Answer

Any of the above

Question 9

Which of the following can cause magnesium deficiency?

Accepted Answer

Small bowel resection

Answer

Prolonged artificial ventilation

Answer

Renal disease

Answer

Liver cirrhosis

Question 10

Intensive management of diabetes is needed in all situations except:

Accepted Answer

Autonomic neuropathy causing hypotension

Answer

Pregnancy

Answer

Post kidney transplant in diabetic nephropathy

Answer

Diabetes Mellitus with acute myocardial infarction

Endocrinology — MCQs

Endocrinology — MCQs

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