Endocrinology Practice Questions

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 drug of choice for managing Type 2 Diabetes Mellitus in a patient with hypertension and obesity?

Empagliflozin. **Explanation:** The management of Type 2 Diabetes Mellitus (T2DM) has shifted from a glucose-centric approach to one focused on **cardiorenal protection**. **Why Empagliflozin is the Correct Answer:** Empagliflozin is an **SGLT-2 inhibitor**. It is the drug of choice in this scenario due to its pleiotropic effects: 1. **Weight Loss:** It induces osmotic diuresis and glucosuria (losing ~300 kcal/day), making it ideal for obese patients. 2. **Blood Pressure Reduction:** The natriuretic effect helps lower systolic blood pressure. 3. **Cardiovascular Benefit:** Large trials (EMPA-REG) proved it reduces Major Adverse Cardiovascular Events (MACE) and hospitalization for heart failure, which is critical for hypertensive diabetics. **Analysis of Incorrect Options:** * **Glibenclamide (Sulfonylurea):** Causes significant **weight gain** and carries a high risk of hypoglycemia. It offers no cardiovascular protection. * **Metformin (Biguanide):** While it is weight-neutral and the traditional first-line agent, current ADA/EASD guidelines prioritize SGLT-2 inhibitors or GLP-1 agonists over Metformin in patients with established atherosclerotic cardiovascular disease (ASCVD) or high CV risk factors (like hypertension and obesity). * **Vildagliptin (DPP-4 Inhibitor):** It is weight-neutral and has a low risk of hypoglycemia but does not provide the superior weight loss or blood pressure benefits seen with SGLT-2 inhibitors. **High-Yield Clinical Pearls for NEET-PG:** * **SGLT-2 Inhibitors Side Effects:** Increased risk of Genital Mycotic Infections (Candidiasis) and Euglycemic Ketoacidosis. * **Drug of Choice for T2DM + Heart Failure:** SGLT-2 inhibitors (e.g., Dapagliflozin, Empagliflozin). * **Drug of Choice for T2DM + CKD (with proteinuria):** SGLT-2 inhibitors are now preferred for their renoprotective effects.

Q: Beta-blockers are used in hyperthyroidism:

As short-term symptomatic therapy until the effect of carbimazole develops. **Explanation:** **1. Why Option A is Correct:** In hyperthyroidism, many clinical manifestations (tachycardia, palpitations, tremors, and anxiety) are due to increased beta-adrenergic sensitivity. Antithyroid drugs like **Carbimazole** or Methimazole inhibit thyroid hormone synthesis but take **3–6 weeks** to achieve a clinical effect because they do not affect pre-formed hormones already in circulation. Beta-blockers (specifically **Propranolol**) provide rapid symptomatic relief within hours, acting as a "bridge" or short-term therapy until the patient reaches a euthyroid state via definitive treatment [1]. **2. Why Other Options are Incorrect:** * **Option B:** After subtotal thyroidectomy, the source of excess hormone is removed. Long-term beta-blockers are unnecessary unless the patient develops permanent arrhythmias or has underlying cardiac disease. * **Option C:** If a patient does not respond to carbimazole, the next steps are usually radioactive iodine (RAI) or surgery, not just beta-blockers, which do not treat the underlying hyperthyroid state [1]. * **Option D:** Beta-blockers do not potentiate the mechanism of RAI. However, they are used to prevent the symptomatic "thyroid storm" that can occasionally be triggered by the release of stored hormones following RAI treatment. **3. High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice:** Propranolol is the preferred beta-blocker because it also inhibits the **peripheral conversion of T4 to T3** (at high doses). * **Contraindication:** Avoid beta-blockers in hyperthyroid patients with **bronchial asthma**; use cardioselective blockers (e.g., Atenolol) or Calcium Channel Bookers (Diltiazem/Verapamil) instead. * **Thyroid Storm:** Beta-blockers are a cornerstone of management in thyroid storm to control life-threatening sympathetic overactivity.

Q: A 21-year-old male presented with short stature and lack of secondary sexual characteristics. He underwent surgery for a brain tumor 12 years ago and received cranial radiation. Which of the following is true regarding acquired hypopituitarism due to radiation?

Growth hormone is the most common hormonal deficiency.. Radiation-induced hypopituitarism is a common late complication of cranial irradiation for brain tumors. The pituitary gland and hypothalamus are sensitive to radiation, and the damage is typically **dose-dependent, progressive, and permanent.** [1] **1. Why Option C is Correct:** The anterior pituitary hormones follow a predictable sequence of loss after radiation. **Growth Hormone (GH) deficiency** is almost universally the first to manifest, followed by gonadotropins (LH/FSH), then TSH, and finally ACTH. In pediatric or young adult patients, this typically presents as short stature and delayed puberty, as seen in this case. [2] **2. Why the Other Options are Incorrect:** * **Option A:** At a dose of **50 Gy**, the risk is significantly higher than 5%. Approximately **50–90%** of patients receiving this dose will develop some form of hypothalamic-pituitary dysfunction within 5–10 years. * **Option B:** Radiation-induced damage is not immediate. While some changes occur early, the majority of clinical deficiencies manifest **years (typically 2 to 10 years)** after treatment. It requires long-term surveillance. * **Option D:** **Children and young adults** are at the highest risk. Their developing endocrine axes are more sensitive to radiation damage compared to older adults. **Clinical Pearls for NEET-PG:** * **Sequence of loss:** GH > LH/FSH > TSH > ACTH (Mnemonic: **"Go Look For The Adenoma"** – GH, LH, FSH, TSH, ACTH). * **Hyperprolactinemia:** Unlike other hormones which decrease, prolactin levels may **increase** after radiation due to damage to the hypothalamic dopaminergic pathways (loss of tonic inhibition). * **Primary site of damage:** In many cases of cranial radiation, the **hypothalamus** is more sensitive and is the primary site of injury rather than the pituitary gland itself.

Q: Type I diabetes mellitus may be associated with which of the following conditions?

Celiac Disease. **Explanation:** **1. Why Celiac Disease is Correct:** Type 1 Diabetes Mellitus (T1DM) is an organ-specific autoimmune disorder characterized by the destruction of pancreatic beta cells [2]. It is frequently associated with other **autoimmune polyendocrine syndromes (APS)** because these conditions share a common genetic predisposition, specifically linked to **HLA-DR3 and HLA-DR4** genotypes [2]. Celiac disease is an autoimmune enteropathy triggered by gluten; approximately 5–10% of patients with T1DM are found to have biopsy-proven Celiac disease [1]. Screening for Celiac disease (via tissue transglutaminase antibodies) is a standard clinical recommendation for all newly diagnosed T1DM patients. **2. Analysis of Incorrect Options:** * **Obesity:** This is a hallmark risk factor for **Type 2 Diabetes Mellitus**, characterized by insulin resistance. T1DM patients are typically lean or present with weight loss at diagnosis due to an absolute insulin deficiency and catabolism [2]. * **Down’s Syndrome:** While Down’s syndrome is associated with an increased risk of T1DM and hypothyroidism, it is a chromosomal disorder (Trisomy 21), not an autoimmune condition directly "associated" in the context of shared pathophysiology like Celiac disease. * **Precocious Puberty:** There is no established pathophysiological link between T1DM and precocious puberty. In fact, poorly controlled T1DM is more commonly associated with **delayed puberty** and growth retardation (Mauriac Syndrome). **High-Yield Clinical Pearls for NEET-PG:** * **Common Autoimmune Associations with T1DM:** Hashimoto’s thyroiditis (most common), Graves' disease, Celiac disease, Addison’s disease, and Vitiligo [1]. * **HLA Associations:** HLA-DR3/DR4 and DQ8 are strongly linked to T1DM [2]. * **Screening Rule:** Always screen T1DM patients for **Thyroid Peroxidase (TPO) antibodies** and **Celiac disease** regardless of symptoms.

Question 1

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 2

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 3

What is the drug of choice for managing Type 2 Diabetes Mellitus in a patient with hypertension and obesity?

Accepted Answer

Empagliflozin

Answer

Glibenclamide

Answer

Metformin

Answer

Vildagliptin

Question 4

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 5

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

Question 6

Beta-blockers are used in hyperthyroidism:

Accepted Answer

As short-term symptomatic therapy until the effect of carbimazole develops

Answer

As long-term therapy after subtotal thyroidectomy

Answer

In patients not responding to carbimazole

Answer

To potentiate the effect of radioactive iodine

Question 7

Plasma of a hyperthyroid patient contains excess of which substance?

Accepted Answer

Free thyroxine

Answer

T3

Answer

Protein bound thyroxine

Answer

Reverse T3 (RT3)

Question 8

What is the therapy of choice for diffuse toxic goiter in a patient over 45 years of age?

Accepted Answer

Radioactive iodine

Answer

Surgery

Answer

Antithyroid drugs

Answer

Antithyroid drugs first followed by surgery

Question 9

A 21-year-old male presented with short stature and lack of secondary sexual characteristics. He underwent surgery for a brain tumor 12 years ago and received cranial radiation. Which of the following is true regarding acquired hypopituitarism due to radiation?

Accepted Answer

Growth hormone is the most common hormonal deficiency.

Answer

At a dose of 50 Gy of radiation, only 5% of patients will manifest hypopituitarism.

Answer

The majority of patients who develop hypopituitarism after cranial radiation do so within a year of treatment.

Answer

Older adults are at the highest risk from radiation-induced hypopituitarism.

Question 10

Type I diabetes mellitus may be associated with which of the following conditions?

Accepted Answer

Celiac Disease

Answer

Obesity

Answer

Down's syndrome

Answer

Precocious puberty

Endocrinology — MCQs

Endocrinology — MCQs

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