Endocrinology Practice Questions

Q: A 50-year-old man with advanced tuberculosis and signs of severe acute adrenal insufficiency should be treated immediately with a combination of:

Cortisol and fludrocortisone. ***Cortisol and fludrocortisone*** - **Cortisol** (a **glucocorticoid**) is essential to replace the deficient hormone in acute adrenal insufficiency, addressing symptoms like **hypotension** and **hypoglycemia** [1], [2]. - **Fludrocortisone** (a **mineralocorticoid**) is also critical as patients with primary adrenal insufficiency (such as that caused by advanced tuberculosis) have deficient **aldosterone** production, requiring mineralocorticoid replacement [1]. *Aldosterone and fludrocortisone* - **Aldosterone** is the natural mineralocorticoid, but it's not administered directly as a drug in this context; instead, **fludrocortisone** is used for its mineralocorticoid effects. - While fludrocortisone is appropriate, aldosterone alone would not address the critical glucocorticoid deficiency seen in acute adrenal crisis [1]. *Triamcinolone and dexamethasone* - Both **triamcinolone** and **dexamethasone** are potent **glucocorticoids** but lack significant mineralocorticoid activity. - In acute adrenal insufficiency, both glucocorticoid and mineralocorticoid replacement are crucial, making this combination insufficient [1]. *Dexamethasone and metyrapone* - **Dexamethasone** is a potent **glucocorticoid** but, like **triamcinolone**, lacks sufficient mineralocorticoid activity for complete replacement [1]. - **Metyrapone** is an adrenal enzyme inhibitor used to reduce cortisol production, making it contraindicated in adrenal insufficiency, where cortisol levels are already dangerously low.

Q: An obese female patient presented with hypertension, chronic headache, and normal pituitary function. The most likely diagnosis is

Empty Sella Syndrome. Empty Sella Syndrome - This condition involves herniation of the arachnoid and CSF into the sella turcica, compressing the **pituitary gland**. While the pituitary gland is compressed, its function is often preserved, hence **normal pituitary function**. - Often associated with **obesity**, **hypertension**, and **headaches** (including chronic headaches) due to increased intracranial pressure. *Cushing's disease* - Characterized by **pituitary adenoma** secreting excess **ACTH**, leading to **hypercortisolism**. [1], [2] - Symptoms include central obesity, hypertension, and headaches, but would present with **abnormal pituitary function** (elevated ACTH and cortisol). [1] *Prolactinoma* - A **pituitary tumor** that secretes excessive **prolactin**, causing symptoms like galactorrhea, amenorrhea (in women), and hypogonadism. - While it can cause headaches, it typically leads to **abnormal pituitary function** with elevated prolactin levels, which is not mentioned here. *Hypothyroidism* - A condition caused by **underproduction of thyroid hormones**, leading to symptoms like weight gain, fatigue, cold intolerance, and bradycardia. - While it can be associated with weight gain and some headaches, it does not typically cause **hypertension** as a primary symptom related to the thyroid, and would present with **abnormal thyroid function tests**, not normal pituitary function.

Q: A physician is evaluating a patient with hypogonadotropic hypogonadism and anosmia. What condition is most likely suspected in this scenario?

Kallmann syndrome. ***Kallmann syndrome*** - This syndrome is characterized by **hypogonadotropic hypogonadism** (due to GnRH deficiency) combined with **anosmia** (impaired sense of smell) or hyposmia [1]. - The anosmia results from the **agenesis or hypoplasia of the olfactory bulbs and tracts**, which is a key diagnostic feature. *Asherman's syndrome* - This condition is characterized by **intrauterine adhesions** or synechiae, usually occurring after uterine surgery or infection. - It primarily causes **secondary amenorrhea** and infertility but does not involve hypogonadotropic hypogonadism or anosmia. *Stein-Leventhal syndrome* - This is an older term for **Polycystic Ovary Syndrome (PCOS)**, characterized by **anovulation**, hyperandrogenism, and polycystic ovaries [1]. - It is associated with **insulin resistance** and metabolic dysfunction but not anosmia or hypogonadotropic hypogonadism. *Sheehan's syndrome* - This is a form of **hypopituitarism** caused by **ischemic necrosis of the pituitary gland** following severe postpartum hemorrhage [1]. - It leads to deficiencies in various pituitary hormones, including gonadotropins, but it is typically acute postpartum and does not present with anosmia.

Q: What is the fasting blood glucose level that confirms a diagnosis of diabetes mellitus?

≥126. ≥126 - A fasting plasma glucose (FPG) level of ≥126 mg/dL on two separate occasions is a diagnostic criterion for diabetes mellitus [1]. - This threshold indicates persistent hyperglycemia beyond what is considered normal. <100 - A fasting plasma glucose level 200 - A random plasma glucose (RPG) level >200 mg/dL with classic symptoms of diabetes (e.g., polyuria, polydipsia, unexplained weight loss) can confirm diabetes [1]. - However, for a fasting blood glucose alone to confirm diabetes, it needs to be ≥126 mg/dL, and a level >200 mg/dL would be an even more severe manifestation.

Q: Which of the following is the MOST specific finding in primary hypothyroidism?

High TSH. ***High TSH*** - A **high TSH** (thyroid-stimulating hormone) is the most specific indicator of **primary hypothyroidism** because it reflects the pituitary gland's attempt to stimulate a failing thyroid gland [1]. - In primary hypothyroidism, the thyroid gland itself is unable to produce sufficient thyroid hormones, leading to a feedback mechanism that increases TSH secretion [1]. *Low T3* - While **low T3** (triiodothyronine) can be seen in hypothyroidism, it is often the last thyroid hormone to decrease significantly and can be associated with other conditions, such as **euthyroid sick syndrome** [1]. - Therefore, low T3 is less specific for diagnosing primary hypothyroidism than TSH levels [1]. *Low triglycerides* - **Hypothyroidism** is typically associated with **hyperlipidemia**, including **elevated triglycerides**, due to decreased catabolism of lipoproteins. - Thus, low triglycerides would be an unexpected finding in primary hypothyroidism. *High cholesterol* - **High cholesterol** is a common finding in **hypothyroidism** due to reduced clearance of LDL cholesterol [2]. - However, high cholesterol is a non-specific finding and can be caused by many other factors, such as diet, genetics, and other metabolic syndromes, making it less specific for hypothyroidism compared to TSH.

Q: Hypothyroidism with an increased TSH level is seen in all except which of the following?

Sheehan's syndrome. ***Sheehan's syndrome*** - Sheehan's syndrome is a cause of **secondary hypothyroidism** [4], meaning the problem lies in the **pituitary gland's inability to produce TSH**, leading to low TSH and low thyroid hormones. - In this condition, the TSH level would be **low or inappropriately normal**, not increased, as the pituitary is damaged [2]. *Lithium carbonate therapy* - Lithium can **inhibit thyroid hormone release** and synthesis, leading to **primary hypothyroidism** where the thyroid gland is the culprit. - This results in a feedback loop that causes the pituitary to produce **increased TSH** to try and stimulate the failing thyroid [1]. *Post radioiodine ablation* - Radioiodine ablation **destroys thyroid cells**, leading to a direct inability of the thyroid gland to produce sufficient hormones. - This condition mimics spontaneous primary hypothyroidism, causing the pituitary to release **increased TSH** in an attempt to stimulate the damaged thyroid [1][3]. *Endemic goitre* - Endemic goitre is often caused by **iodine deficiency**, which impairs the thyroid's ability to synthesize thyroid hormones. - This is a form of **primary hypothyroidism** leading to **increased TSH** as the pituitary tries to compensate for the low thyroid hormone levels [1].

Q: All of the following can cause osteoporosis, except which of the following?

Fluorosis. ***Fluorosis*** - **Fluorosis** is a condition caused by excessive fluoride intake, which leads to **increased bone density** (osteosclerosis) and abnormal bone formation, not osteoporosis. - While it can cause bone pain and weakness, its characteristic effect is **hardening of bones**, making them brittle but denser, rather than porous. *Steroids* - Prolonged use of **glucocorticoids (steroids)** is a common cause of secondary osteoporosis [1]. - They decrease osteoblast activity and increase osteoclast activity, leading to **reduced bone formation** and **increased bone resorption** [1]. *Thyrotoxicosis* - **Thyrotoxicosis**, or hyperthyroidism, causes an increase in bone turnover with a greater increase in **bone resorption** than formation. - This imbalance results in **net bone loss** and can lead to osteoporosis. *Hyperparathyroidism* - **Primary hyperparathyroidism** leads to excessive secretion of parathyroid hormone (PTH), which continuously stimulates osteoclasts. - This results in **increased bone resorption**, particularly from cortical bone, causing osteoporosis.

Q: Which of the following is not a known cause of osteoporosis?

Hypoparathyroidism. ### Hypoparathyroidism - This condition leads to **low parathyroid hormone (PTH)** levels, resulting in **decreased serum calcium** and **increased serum phosphate**. - While it can affect bone metabolism, severe cases typically present with **increased bone mineral density** or **osteosclerosis**, not osteoporosis, due to reduced bone resorption. *Sarcoidosis* - This granulomatous disease can cause **hypercalcemia** due to extrarenal production of **calcitriol** (1,25-dihydroxyvitamin D) by activated macrophages. - The resulting hypercalcemia and prolonged high calcitriol levels can lead to **increased bone turnover** and **osteoporosis** [4]. *Old age* - Bone density naturally declines with age, especially after menopause in women due to **estrogen deficiency** [3]. - This age-related bone loss is a primary factor in the development of **primary osteoporosis** [2]. *Steroid therapy* - **Glucocorticoid-induced osteoporosis** is a common cause of secondary osteoporosis [1]. - Steroids decrease osteoblast activity, increase osteoclast activity, and impair calcium absorption, all contributing to **bone loss** [1].

Q: A 35-year-old female with a history of diabetes presents with a painless neck swelling that moves with swallowing. She also reports constipation, weight gain, hoarseness, oligomenorrhea, and mild paresthesias. Examination reveals bradycardia, cold extremities, non-pitting edema, and delayed relaxation of deep tendon reflexes. Thyroid function tests show high TSH and low unbound T4 levels. Laboratory workup also reveals positive thyroid peroxidase antibodies, consistent with autoimmune thyroiditis. Given this condition, which type of cancer is she at risk of developing?

Papillary thyroid carcinoma. ***Papillary thyroid carcinoma*** - The patient's **TSH elevation**, low T4, and presence of **TPO antibodies** suggests Hashimoto's thyroiditis, which is associated with a higher risk of developing papillary thyroid carcinoma. - Symptoms such as a **firm thyroid nodule** and hoarseness raise suspicion for malignancy, especially in the context of autoimmune thyroid disease. *Follicular thyroid carcinoma* - Typically presents with **cold nodules** on radioactive iodine uptake and is less associated with autoimmune conditions than papillary carcinoma. - The clinical and laboratory features presented are more indicative of **papillary thyroid carcinoma** rather than follicular. *Anaplastic thyroid carcinoma* - Typically presents in older patients, often with a **rapidly enlarging neck mass** and significant **symptoms of obstruction**. - This case lacks key features like aggressive clinical presentation and is more consistent with **differentiated thyroid cancers**. [1] *Medullary thyroid carcinoma* - Arises from **C-cells (parafollicular cells)** and may be associated with **MEN syndromes**. - Not related to **TSH/T4 levels** or autoimmune thyroid conditions, and typically presents with **elevated calcitonin levels**.

Question 1

A 50-year-old man with advanced tuberculosis and signs of severe acute adrenal insufficiency should be treated immediately with a combination of:

Accepted Answer

Cortisol and fludrocortisone

Answer

Triamcinolone and dexamethasone

Answer

Dexamethasone and metyrapone

Answer

Aldosterone and fludrocortisone

Question 2

An obese female patient presented with hypertension, chronic headache, and normal pituitary function. The most likely diagnosis is

Accepted Answer

Empty Sella Syndrome

Answer

Cushing's disease

Answer

prolactinoma

Answer

Hypothyroidism

Question 3

A physician is evaluating a patient with hypogonadotropic hypogonadism and anosmia. What condition is most likely suspected in this scenario?

Accepted Answer

Kallmann syndrome

Answer

Asherman's syndrome

Answer

Stein-Leventhal syndrome

Answer

Sheehan's syndrome

Question 4

What is the most appropriate insulin regimen for achieving tight control of blood sugar levels in a 20-year-old male with type 1 diabetes mellitus?

Accepted Answer

Morning injections of insulin detemir with insulin aspart at mealtimes.

Answer

Morning injection of NPH insulin and evening injection of regular insulin.

Answer

Morning injections of insulin lispro with evening injections of insulin glulisine.

Answer

Evening injections of mixed regular insulin and insulin glargine for basal control.

Question 5

What is the fasting blood glucose level that confirms a diagnosis of diabetes mellitus?

Accepted Answer

≥126

Answer

>200

Answer

<100

Answer

101-125

Question 6

Which of the following is the MOST specific finding in primary hypothyroidism?

Accepted Answer

High TSH

Answer

Low T3

Answer

Low triglycerides

Answer

High cholesterol

Question 7

Hypothyroidism with an increased TSH level is seen in all except which of the following?

Accepted Answer

Sheehan's syndrome

Answer

Post radioiodine ablation

Answer

Endemic goitre

Answer

Lithium carbonate therapy

Question 8

All of the following can cause osteoporosis, except which of the following?

Accepted Answer

Fluorosis

Answer

Steroids

Answer

Thyrotoxicosis

Answer

Hyperparathyroidism

Question 9

Which of the following is not a known cause of osteoporosis?

Accepted Answer

Hypoparathyroidism

Answer

Sarcoidosis

Answer

Old age

Answer

Steroid therapy

Question 10

A 35-year-old female with a history of diabetes presents with a painless neck swelling that moves with swallowing. She also reports constipation, weight gain, hoarseness, oligomenorrhea, and mild paresthesias. Examination reveals bradycardia, cold extremities, non-pitting edema, and delayed relaxation of deep tendon reflexes. Thyroid function tests show high TSH and low unbound T4 levels. Laboratory workup also reveals positive thyroid peroxidase antibodies, consistent with autoimmune thyroiditis. Given this condition, which type of cancer is she at risk of developing?

Accepted Answer

Papillary thyroid carcinoma

Answer

Follicular thyroid carcinoma

Answer

Anaplastic thyroid carcinoma

Answer

Medullary thyroid carcinoma

Endocrinology — MCQs

Endocrinology — MCQs

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