Endocrinology Practice Questions

Q: Which of the following is the most prominent clinical manifestation of primary hyperaldosteronism (Conn's syndrome)?

Hypertension. ** Hypertension** - **Hypertension** is the most prominent and consistent clinical manifestation of primary hyperaldosteronism, present in nearly all patients. - The excessive aldosterone leads to increased **sodium reabsorption** and water retention, directly causing elevated blood pressure [2], [3]. *Hypokalemia* - While **hypokalemia** is common in primary hyperaldosteronism due to increased renal potassium excretion, it is not universally present and can be absent in a significant portion of patients (up to 30-50%). - Therefore, hypertension is a more reliable and prominent symptom for initial suspicion [3]. *Hyperkalemia* - **Hyperkalemia** is inconsistent with primary hyperaldosteronism; the hallmark of the condition is **potassium wasting** and **hypokalemia**, not elevated potassium levels [2]. - Aldosterone's primary role includes promoting potassium excretion, so hyperkalemia would indicate a different underlying pathology, such as adrenal insufficiency [2]. *Expansion of Extracellular and Plasma volume* - While increased aldosterone does lead to **expansion of extracellular and plasma volume** due to sodium and water retention, this is a physiological consequence that contributes to hypertension rather than being the most prominent *clinical manifestation* itself [1]. - Hypertension is the direct observable and measurable clinical symptom that drives investigation [3].

Q: Which of the following conditions is least likely to be associated with diabetes mellitus?

Fanconi syndrome. ***Fanconi syndrome*** - This syndrome primarily involves a generalized defect in **proximal renal tubular function**, leading to excessive excretion of glucose, amino acids, phosphate, and bicarbonate. - While it can be inherited or acquired, it is **not directly linked** to the pathogenesis or common complications of diabetes mellitus. *Noonan syndrome* - Individuals with Noonan syndrome are at an **increased risk of developing diabetes mellitus**, often due to insulin resistance and impaired glucose tolerance. - This genetic disorder, characterized by distinctive facial features, short stature, and cardiac defects, includes **endocrine abnormalities** that predispose to metabolic dysfunction. *Ataxia telangiectasia* - This rare, **autosomal recessive immune deficiency disorder** is associated with an increased incidence of diabetes mellitus [1]. - Patients often present with **insulin resistance** and impaired glucose homeostasis, making diabetes a recognized comorbidity [2]. *Myotonic dystrophy* - Myotonic dystrophy, particularly type 1, is frequently associated with **endocrine abnormalities**, including a high prevalence of **insulin resistance** and impaired glucose tolerance, often progressing to diabetes mellitus [2]. - This inherited neuromuscular disorder can manifest with a variety of systemic complications, with diabetes being a common one.

Q: Bones, stones, abdominal groans, and psychiatric overtones are features of?

Hyperparathyroidism. ***Hyperparathyroidism*** - This mnemonic ("**bones, stones, abdominal groans, and psychiatric overtones**") perfectly describes the classic manifestations of **hypercalcemia** due to hyperparathyroidism [1]. - **Bones** refers to bone pain from increased osteoclastic activity [1], **stones** to kidney stones [1], **abdominal groans** to GI symptoms like constipation or pancreatitis [1], and **psychiatric overtones** to neuropsychiatric symptoms like depression or confusion. *Hyperthyroidism* - Characterized by symptoms of an **overactive metabolism**, such as weight loss, heat intolerance, tremor, and tachycardia [1]. - It does not typically present with the "bones, stones, and groans" triad associated with calcium imbalances. *Hypothyroidism* - Involves symptoms of an **underactive metabolism**, including weight gain, cold intolerance, fatigue, and bradycardia. - While it can cause some psychiatric symptoms (e.g., depression), it does not involve issues like kidney stones or significant bone problems from hypercalcemia. *Hypoparathyroidism* - Leads to **hypocalcemia**, presenting with symptoms like **tetany**, muscle cramps, paresthesias, and seizures. - This is the opposite of hyperparathyroidism and would not cause the symptoms listed in the mnemonic.

Q: Nelson's syndrome is most likely seen after removal of both adrenal glands.

Adrenalectomy. ***Adrenalectomy*** - Nelson's syndrome develops in some patients following bilateral **adrenalectomy** performed for **Cushing's disease**. - The removal of the adrenal glands leads to a loss of negative feedback on the pituitary, causing uncontrolled growth of a pre-existing **corticotroph adenoma** and increased **ACTH** production. *Hypophysectomy* - **Hypophysectomy** is the surgical removal of the **pituitary gland**, which would prevent the development of Nelson's syndrome as it removes the source of ACTH. - This procedure is a treatment for Cushing's disease, but Nelson's syndrome occurs *after* adrenalectomy, not hypophysectomy. *Thyroidectomy* - **Thyroidectomy** is the removal of all or part of the **thyroid gland** and is unrelated to adrenal or pituitary dysfunction. - This procedure is typically performed for conditions like thyroid cancer, hyperthyroidism, or large goiters. *Orchidectomy* - **Orchidectomy** is the surgical removal of one or both **testes**. - This procedure is primarily used in the treatment of testicular cancer or for hormonal therapy in prostate cancer and has no connection to Nelson's syndrome.

Q: For differentiating between insulinoma and sulfonylurea-related hypoglycemia, which test is most useful?

Plasma C-peptide level. Detailed testing is required to distinguish sources of hypoglycemia. Plasma C-peptide level: A high C-peptide level despite hypoglycemia suggests endogenous insulin secretion, as seen in insulinoma [1]. In sulfonylurea-induced hypoglycemia, a high C-peptide would also be seen because sulfonylureas stimulate endogenous insulin release from beta cells [2]. However, in an exogenous insulin injection, it would be low. Antibody to insulin: Antibody to insulin is primarily used to detect exogenous insulin administration due to an immune response. While it might be present in rare cases of autoimmune hypoglycemia, it is not the primary diagnostic tool to differentiate between these two conditions. Plasma insulin level: Both insulinoma and sulfonylurea use lead to elevated plasma insulin levels during hypoglycemia, as both involve increased insulin activity [1]. Therefore, insulin levels alone would not help distinguish between these two causes of hypoglycemia. Insulin:glucose ratio: The insulin:glucose ratio would be elevated in both insulinoma and sulfonylurea-induced hypoglycemia. This ratio indicates an inappropriately high level of insulin for the given glucose concentration, but it does not differentiate between endogenous overproduction and sulfonylurea stimulation.

Q: A 32-year-old female who underwent whole-brain irradiation therapy following tumor growth in the brain is most likely to experience which hormone deficiency? (Select one correct answer)

Gonadotropin deficiency. A 32-year-old female who underwent whole-brain irradiation therapy following tumor growth in the brain is most likely to experience which hormone deficiency? ***Gonadotropin deficiency*** - The **gonadotrophs** (producing **LH and FSH**) are among the most sensitive pituitary cells to radiation damage, often leading to early and significant deficiency [1]. - This is particularly common after **whole-brain irradiation** due to the pituitary's location within the radiation field [1]. *Prolactin deficiency* - **Lactotrophs** (producing **prolactin**) are generally considered to be among the *most resistant* cells to radiation-induced damage. - **Prolactin deficiency** is rare even after high doses of radiation and is usually only seen with extensive pituitary damage. *ACTH deficiency* - **Corticotrophs** (producing **ACTH**) are moderately sensitive to radiation, but usually less so than gonadotrophs [1]. - While possible, **ACTH deficiency** typically develops later than gonadotropin deficiency or requires higher doses of radiation [1]. *Growth hormone deficiency* - **Somatotrophs** (producing **GH**) are often the second most sensitive cells to radiation damage after gonadotrophs [1]. - While common after cranial irradiation, **gonadotropin deficiency** typically manifests earlier or with lower doses than GH deficiency [1].

Q: Osteitis fibrosa cystica is associated with which of the following conditions?

Hyperparathyroidism. ***Hyperparathyroidism*** - **Osteitis fibrosa cystica** is a classic bone manifestation of severe, chronic **hyperparathyroidism**, characterized by increased osteoclastic activity. - This condition results in the replacement of normal bone with **fibrous tissue** and **cysts**, often leading to bone pain, fractures, and deformities. *Hypoparathyroidism* - **Hypoparathyroidism** is characterized by low parathyroid hormone (PTH) levels and **hypocalcemia**, which typically leads to increased bone density, not bone degradation. - Its manifestations include muscle cramps, seizures, and tetany, without the bone lesions seen in osteitis fibrosa cystica. *Hypothyroidism* - **Hypothyroidism** is a state of thyroid hormone deficiency, affecting metabolism and growth but not directly causing osteitis fibrosa cystica. - It can lead to slowed bone turnover and delayed growth in children, but not the specific bone lesions associated with parathyroid dysfunction. *Hyperthyroidism* - **Hyperthyroidism** can cause increased bone turnover and **osteoporosis** due to accelerated bone resorption, but it does not lead to the distinct fibrous and cystic bone changes of osteitis fibrosa cystica. - Its effects on bone are generally a diffuse reduction in bone mineral density rather than specific lytic lesions or brown tumors.

Q: The endocrine disorder associated with generalized lymphadenopathy is?

Hyperthyroidism. ***Hyperthyroidism*** - **Generalized lymphadenopathy** can be a clinical manifestation of **hyperthyroidism**, particularly in conditions like **Graves' disease** [1]. - This is thought to be due to **immunological overactivity** often associated with autoimmune thyroid conditions [2]. *Addison's disease* - **Addison's disease** is characterized by **adrenal insufficiency** and typically presents with symptoms like **fatigue**, **skin hyperpigmentation**, and **hypotension**. - It is not commonly associated with **generalized lymphadenopathy**. *Cushing's syndrome* - **Cushing's syndrome** results from **prolonged exposure to high levels of cortisol**, leading to symptoms like **central obesity**, **moon facies**, and **hirsutism**. - **Lymphadenopathy** is not a feature of **Cushing's syndrome**; in fact, chronic cortisol excess can cause **lymphopenia**. *Carcinoid syndrome* - **Carcinoid syndrome** is caused by **neuroendocrine tumors** secreting **vasoactive substances** like serotonin, leading to symptoms such as **flushing**, **diarrhea**, and **bronchospasm**. - **Lymphadenopathy** is not typically part of the carcinoid syndrome, although tumor metastasis to lymph nodes can occur.

Q: Which of the following statements about testicular feminizing syndrome is incorrect?

Absent vagina. ### Absent vagina - This statement is incorrect. In **complete androgen insensitivity syndrome (CAIS)**, formerly known as testicular feminizing syndrome, individuals develop a **blind-ending vagina** that is typically shorter than normal, but it is not entirely absent. - The external genitalia are unambiguously female, leading to a female appearance, but the presence of testes and lack of a uterus/fallopian tubes are key features. *Absent ovary* - This statement is correct. Individuals with **complete androgen insensitivity syndrome (CAIS)** are **genetically male (46,XY)** and have **testes**, not ovaries. - The testes are usually undescended (intra-abdominal or inguinal) and produce androgens, but the body's cells are unresponsive to these hormones. *Chromosome pattern 46 x Y* - This statement is correct. **Complete androgen insensitivity syndrome (CAIS)** is characterized by a **46,XY karyotype**, meaning individuals are genetically male [1]. - Despite the male genotype, the inability to respond to androgens leads to female external phenotypic development. *Absent uterus* - This statement is correct. In **complete androgen insensitivity syndrome (CAIS)**, the **testes produce anti-Müllerian hormone (AMH)**, which causes the regression of the Müllerian ducts. - As a result, structures derived from the Müllerian ducts, such as the **uterus** and fallopian tubes, are absent.

Q: All of the following statements regarding diabetes mellitus are true, except one:

Insulin is never used in Type II Diabetes mellitus. ***Insulin is never used in Type II Diabetes mellitus*** - This statement is incorrect because insulin therapy is a common treatment for Type II Diabetes mellitus, particularly when **oral medications** and **lifestyle modifications** are insufficient to control blood glucose levels. [1] - Many patients with Type II DM eventually experience pancreatic beta-cell dysfunction, necessitating **exogenous insulin** to achieve glycemic targets. [1] [2] *Insulin levels may be decreased in patients with Type II Diabetes mellitus* - While Type II DM is initially characterized by **insulin resistance** and compensatory hyperinsulinemia, over time the **pancreatic beta cells** can fail, leading to reduced insulin production. [2] - This decline in insulin secretion necessitates insulin therapy in later stages of the disease. *Insulin is essential to reverse Diabetic Ketoacidosis* - **Diabetic Ketoacidosis (DKA)** is a life-threatening complication primarily of Type 1 DM (but can occur in Type 2 DM) characterized by **severe insulin deficiency**, hyperglycemia, ketosis, and acidosis. [2] [3] - **Insulin therapy** is critical to stop ketogenesis, promote glucose uptake, and correct metabolic acidosis. *Intravenous Insulin is administered as a sliding scale in the hospital setting* - A **sliding scale insulin regimen** involves administering insulin doses based on current blood glucose readings, often used in hospital settings for both Type 1 and Type 2 DM patients. - While often used, it is increasingly being replaced by **basal-bolus regimens** for better glycemic control. [1]

Question 1

Which of the following is the most prominent clinical manifestation of primary hyperaldosteronism (Conn's syndrome)?

Accepted Answer

Hypertension

Answer

Hyperkalemia

Answer

Hypokalemia

Answer

Expansion of Extracellular and Plasma volume

Question 2

Which of the following conditions is least likely to be associated with diabetes mellitus?

Accepted Answer

Fanconi syndrome

Answer

Noonan syndrome

Answer

Ataxia telengiectasia

Answer

Myotonic dystrophy

Question 3

Bones, stones, abdominal groans, and psychiatric overtones are features of?

Accepted Answer

Hyperparathyroidism

Answer

Hypothyroidism

Answer

Hypoparathyroidism

Answer

Hyperthyroidism

Question 4

Nelson's syndrome is most likely seen after removal of both adrenal glands.

Accepted Answer

Adrenalectomy

Answer

Hypophysectomy

Answer

Thyroidectomy

Answer

Orchidectomy

Question 5

For differentiating between insulinoma and sulfonylurea-related hypoglycemia, which test is most useful?

Accepted Answer

Plasma C-peptide level

Answer

Insulin:glucose ratio

Answer

Plasma insulin level

Answer

Antibody to insulin

Question 6

A 32-year-old female who underwent whole-brain irradiation therapy following tumor growth in the brain is most likely to experience which hormone deficiency? (Select one correct answer)

Accepted Answer

Gonadotropin deficiency

Answer

Prolactin deficiency

Answer

ACTH deficiency

Answer

Growth hormone deficiency

Question 7

Osteitis fibrosa cystica is associated with which of the following conditions?

Accepted Answer

Hyperparathyroidism

Answer

Hypoparathyroidism

Answer

Hypothyroidism

Answer

Hyperthyroidism

Question 8

The endocrine disorder associated with generalized lymphadenopathy is?

Accepted Answer

Hyperthyroidism

Answer

Addison's disease

Answer

Carcinoid syndrome

Answer

Cushing's syndrome

Question 9

Which of the following statements about testicular feminizing syndrome is incorrect?

Accepted Answer

Absent vagina

Answer

Absent ovary

Answer

Chromosome pattern 46 x Y

Answer

Absent uterus

Question 10

All of the following statements regarding diabetes mellitus are true, except one:

Accepted Answer

Insulin is never used in Type II Diabetes mellitus

Answer

Insulin levels may be decreased in patients with Type II Diabetes mellitus

Answer

Insulin is essential to reverse Diabetic Ketoacidosis

Answer

Intravenous Insulin is administered as a sliding scale in the hospital setting

Endocrinology — MCQs

Endocrinology — MCQs

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