Endocrinology Practice Questions

Q: Tufting of the distal phalanx is characteristically seen in which of the following conditions?

Hyperparathyroidism. ***Hyperparathyroidism*** - Tufting of the distal phalanx is a classic radiological feature associated with **hyperparathyroidism**, due to increased bone resorption. - This condition leads to **subperiosteal bone resorption**, especially noticeable in the phalangeal tufts of the fingers [2]. *Gout* - Gout is characterized by the **deposition of uric acid crystals**, typically affecting the **metatarsophalangeal** joint [1]. - It does not exhibit the specific bony changes such as tufting seen in hyperparathyroidism. *Hypoparathyroidism* - Hypoparathyroidism leads to **hypocalcemia** and symptoms such as tetany, but does not cause tufting of the distal phalanx. - This condition is marked by **bone density increases**, contrary to the resorption seen in hyperparathyroidism. *Hyperkalemia* - Hyperkalemia refers to abnormally high **potassium levels** and is primarily associated with renal issues and cardiac symptoms. - It has no direct connection to bony changes or tufting of the phalanges.

Q: Poorly controlled diabetes with blood sugar of 450 mg% is associated with:

Hypokalemia. **Hypokalemia** - **Insulin deficiency** in uncontrolled diabetes leads to an **extracellular shift of potassium** because insulin facilitates potassium entry into cells [1]. - **Diabetic ketoacidosis (DKA)**, a common complication of uncontrolled diabetes, causes significant **renal potassium loss** due to osmotic diuresis and vomiting, even if serum potassium appears normal or high initially [1], [2]. *Hyponatremia* - **Hyperglycemia** can cause **pseudohyponatremia** due to the osmotic effect of high glucose drawing water from cells into the extracellular space, diluting serum sodium [1]. - In severe cases, the true sodium might be low, but the initial effect is dilutional, not a deficit of sodium [1]. *Hypernatremia* - Mild hypernatremia can occur due to **osmotic diuresis** causing significant water loss, but this is less common than dilutional hyponatremia or normal sodium levels. - The primary effect of hyperglycemia on sodium is usually related to dilution rather than an absolute increase in sodium concentration. *Hypomagnesemia* - While diabetic patients can develop **hypomagnesemia** over time due to increased urinary excretion, it is not the most immediate or direct metabolic derangement associated with acute, poorly controlled hyperglycemia (blood sugar 450 mg/dL). - **Hypomagnesemia** is often a chronic complication due to long-term renal losses rather than an acute consequence of severe hyperglycemia.

Q: In which condition are hung-up reflexes typically observed?

Hypothyroidism. ***Hypothyroidism*** - **Hung-up reflexes** (or **Woltman's sign**) are characterized by a **slow relaxation phase** of deep tendon reflexes, a classic finding in hypothyroidism. - This delayed relaxation is due to altered muscle contraction and relaxation kinetics caused by **deficient thyroid hormones**. *Chorea* - Chorea is characterized by **brief, abrupt, irregular, unpredictable, non-stereotyped movements** that flow from one body part to another [1]. - Reflexes themselves are not typically "hung up" but may be difficult to elicit or appear irregular due to the involuntary movements. *Cerebral palsy* - Cerebral palsy is a group of permanent movement disorders that appear in early childhood and are typically characterized by **spasticity**, **ataxia**, or **dystonia**. - While reflex abnormalities are common, including **hyperreflexia** and sustained clonus, the specific finding of "hung-up reflexes" (slow relaxation) is not typical. *Cerebellar ataxia* - Cerebellar ataxia primarily affects **coordination, balance, and gait**, leading to dysmetria, dysdiadochokinesia, and intention tremor [2]. - Reflexes in cerebellar ataxia are often **normal** or can exhibit **pendular reflexes**, where the limb swings back and forth several times after being struck, rather than a delayed relaxation.

Q: In congenital adrenal hyperplasia, which enzyme deficiency is primarily responsible for precocious puberty in males?

21-hydroxylase deficiency. ***21-hydroxylase deficiency*** - This is the **most common form** of congenital adrenal hyperplasia (CAH) and leads to a **deficiency in cortisol and aldosterone** production [1]. - The accumulation of precursors shunts metabolic pathways towards **androgen production**, causing precocious puberty in males due to **excessive adrenal androgens** [1]. *11-beta-hydroxylase deficiency* - This deficiency also leads to **decreased cortisol** and an accumulation of precursors, but it specifically causes an increase in **deoxycorticosterone (DOC)**, which has mineralocorticoid activity. - While it also causes **androgen excess** (leading to precocious puberty in males), it is **less common** than 21-hydroxylase deficiency as the primary cause. *Both* - While both deficiencies can cause androgen excess and precocious puberty, **21-hydroxylase deficiency** is by far the more frequent and significant cause of these symptoms in CAH. - Attributing it equally to both would overlook the **prevalence** and primary impact of 21-hydroxylase deficiency. *Neither* - This option is incorrect because both 21-hydroxylase deficiency and 11-beta-hydroxylase deficiency can lead to **androgen excess**, which is the underlying cause of precocious puberty in CAH. - The condition is characterized by a defect in steroid synthesis, which inevitably results in a **hormonal imbalance**.

Q: At what age is prophylactic thyroidectomy recommended for children with MEN 2A?

5 years for MEN 2A. ***5 years for MEN 2A*** - For **MEN 2A**, prophylactic thyroidectomy is generally recommended by **5 years of age** to prevent the development of medullary thyroid carcinoma (MTC). - This timing allows for careful planning and minimizes the risks associated with surgery in very young children, while still being early enough to be effectively prophylactic. *By 1 year for MEN 2B* - This option is incorrect because **MEN 2B** has a more aggressive form of **medullary thyroid carcinoma (MTC)**, requiring earlier intervention. - Prophylactic thyroidectomy for **MEN 2B** is recommended **within the first year of life**, preferably in the first few months, not necessarily "by" 1 year. *When detected for MEN 2B* - While prompt action upon detection of **RET mutations** is critical, simply stating "when detected" is too broad for **MEN 2B**, where the disease is rapid and age-specific guidelines are crucial. - For **MEN 2B**, prophylactic thyroidectomy should be performed as early as possible, ideally **within the first few months of life**, to prevent highly aggressive MTC. *Any time for MEN 2* - This option is incorrect because the timing of prophylactic thyroidectomy **varies significantly between MEN 2A and MEN 2B** due to differing aggressiveness of MTC. - **MEN 2A** generally allows for an intervention around **age 5**, whereas **MEN 2B** necessitates surgery much earlier, within the **first year of life**, typically within the **first few months**.

Q: The Z score measures bone mineral density compared to the average of which group of individuals?

Individuals matched for age, race, and sex. ***Individuals matched for age, race, and sex*** - A **Z-score** compares a patient's **bone mineral density (BMD)** to the average BMD of a healthy, age-matched, sex-matched, and race-matched population. - It is particularly useful in premenopausal women, men under 50 years of age, and children to help diagnose **secondary osteoporosis**. *Individuals matched for race and sex* - This definition is incomplete as it omits matching for **age**, which is a crucial demographic factor influencing bone density. - Without age-matching, the comparison would not accurately reflect expected bone density for the patient's specific life stage. *Individuals matched for sex* - This is an insufficient comparison for **bone mineral density**, as it excludes critical demographic factors like **age** and **race**. - Bone density naturally varies significantly with age and can also differ across racial groups. *None of the options* - This option is incorrect because the first option accurately describes the reference population for a **Z-score**. - The **Z-score** is a clearly defined metric in bone densitometry with a specific reference group.

Q: A patient presents with polyuria following total hypophysectomy. Laboratory results show Na+ levels at 155 mEq/L and urine osmolarity at 200 mOsm/L. What is the definitive management for this patient?

Lifelong DDAVP supplementation. ### Lifelong DDAVP supplementation - The patient's **polyuria** after **total hypophysectomy**, coupled with **hypernatremia (Na+ 155 mEq/L)** and **low urine osmolarity (200 mOsm/L)**, strongly indicates **central diabetes insipidus (DI)** due to **ADH deficiency** [1]. - **Desmopressin (DDAVP)** is a synthetic analog of **ADH** and is the definitive treatment for central DI, replacing the missing hormone, and addressing the lifelong deficiency [1]. ### No treatment required as receptors are upset - This is incorrect as untreated **diabetes insipidus** can lead to severe **dehydration, hypernatremia, and neurological complications**, making intervention critical [2]. - The symptoms and lab findings indicate a clear deficiency, not merely "upset" receptors, which requires definitive management to prevent life-threatening complications. ### Thiazides for a limited duration of 2 weeks - **Thiazide diuretics** are used in **nephrogenic diabetes insipidus** to induce mild volume depletion, which can increase water reabsorption in the proximal tubule [1]. - However, they are not the definitive treatment for **central DI** where the primary problem is a lack of **ADH**, and using them for a *limited duration* would not address a lifelong condition. ### DDAVP for a limited duration of 2 weeks - While **DDAVP** is the correct treatment for **central DI**, the condition resulting from a total hypophysectomy is **permanent**. - Therefore, treatment for only a *limited duration* would lead to the recurrence of symptoms, and potentially life-threatening complications, making lifelong management essential.

Q: A patient with diabetes mellitus for the past 5 years presents with vomiting and abdominal pain. She is non-compliant with medication and appears dehydrated. Investigations revealed a blood sugar value of 500 mg/dl and the presence of ketone bodies. What is the next best step in management of this patient?

Intravenous fluids with regular insulin. Detailed management of diabetic ketoacidosis (DKA) requires both fluid resuscitation and insulin therapy. ***Intravenous fluids with regular insulin*** - The patient presents with classic signs of **diabetic ketoacidosis (DKA)**: hyperglycemia (blood sugar 500 mg/dl), ketone bodies, dehydration, and a history of diabetes non-compliance [1]. - Initial management for DKA involves aggressive **intravenous fluid resuscitation** to correct dehydration and then **intravenous regular insulin** to lower blood glucose and resolve ketosis [2]. *Intravenous fluids with long-acting insulin* - While fluids are essential, **long-acting insulin** is not appropriate for the acute management of DKA because its slow onset of action makes it inefficient for rapidly correcting hyperglycemia and ketosis. - **Regular insulin** is preferred as it has a quicker onset and shorter duration, allowing for more precise titration in an acute setting [2]. *Intravenous fluids* - Although crucial for correcting **dehydration** and improving renal perfusion, fluids alone will not address the underlying **insulin deficiency** and **ketosis** that define DKA. - Without insulin, the body will continue to produce ketones, exacerbating acidosis [3]. *Intravenous insulin* - Giving intravenous insulin without prior or concomitant **fluid resuscitation** can be dangerous, as it can worsen **hypovolemia** and potentially lead to circulatory collapse by shifting glucose and potassium into cells. - It is critical to first restore **circulating volume** before initiating insulin therapy [2].

Q: MC location of gastrinoma in MEN-1 syndrome?

Duodenum. ***Duodenum*** - In **MEN-1 syndrome**, gastrinomas are most commonly located in the **duodenum**, typically presenting as **multiple small submucosal tumors**. - These duodenal gastrinomas in MEN-1 are characteristically **numerous and tiny**, often difficult to detect during surgery. *Jejunum* - The jejunum is an **uncommon location** for gastrinomas in both sporadic cases and MEN-1 syndrome. - Gastrinomas in the jejunum are typically **rare** and not associated with the characteristic presentation of MEN-1. *Ileum* - The ileum is an **extremely rare site** for gastrinomas in any context. - Gastrinomas developing in the ileum are usually **ectopic** and are not part of the typical MEN-1 syndrome presentation. *Pancreas* - While pancreatic gastrinomas can occur in **MEN-1**, they are **less common** than duodenal gastrinomas in this syndrome. - In **sporadic gastrinomas**, the pancreas is relatively more involved compared to MEN-1, where duodenal predominance is more pronounced.

Q: Which of the following is not seen in MEN 2B syndrome?

Parathyroid adenoma. ***Parathyroid adenoma*** - **Parathyroid adenomas**, leading to hyperparathyroidism, are characteristic of **MEN 2A syndrome**, not MEN 2B [1]. - While both MEN 2A and 2B involve mutations in the **RET proto-oncogene**, the specific clinical manifestations differ significantly. *Megacolon* - **Megacolon** (due to intestinal ganglioneuromatosis) is a recognized feature of **MEN 2B syndrome**. - This condition involves abnormal nerve ganglion cells in the intestine, leading to motility issues. *Mucosal neuroma* - **Mucosal neuromas** on the tongue, lips, and eyelids are a hallmark clinical sign of **MEN 2B syndrome**. - These benign growths are often one of the earliest and most recognizable features. *Marfanoid habitus* - **Marfanoid habitus**, characterized by a tall, slender build with long limbs and arachnodactyly, is a common physical finding in **MEN 2B syndrome**. - This connective tissue abnormality helps distinguish MEN 2B from other MEN syndromes.

Question 1

Tufting of the distal phalanx is characteristically seen in which of the following conditions?

Accepted Answer

Hyperparathyroidism

Answer

Hyperkalemia

Answer

Hypoparathyroidism

Answer

Gout

Question 2

Poorly controlled diabetes with blood sugar of 450 mg% is associated with:

Accepted Answer

Hypokalemia

Answer

Hyponatremia

Answer

Hypernatremia

Answer

Hypomagnesemia

Question 3

In which condition are hung-up reflexes typically observed?

Accepted Answer

Hypothyroidism

Answer

Cerebral palsy

Answer

Chorea

Answer

Cerebellar ataxia

Question 4

In congenital adrenal hyperplasia, which enzyme deficiency is primarily responsible for precocious puberty in males?

Accepted Answer

21-hydroxylase deficiency

Answer

11-beta-hydroxylase deficiency

Answer

Both

Answer

Neither

Question 5

At what age is prophylactic thyroidectomy recommended for children with MEN 2A?

Accepted Answer

5 years for MEN 2A

Answer

By 1 year for MEN 2B

Answer

When detected for MEN 2B

Answer

Any time for MEN 2

Question 6

The Z score measures bone mineral density compared to the average of which group of individuals?

Accepted Answer

Individuals matched for age, race, and sex

Answer

Individuals matched for race and sex

Answer

Individuals matched for sex

Answer

None of the options

Question 7

A patient presents with polyuria following total hypophysectomy. Laboratory results show Na+ levels at 155 mEq/L and urine osmolarity at 200 mOsm/L. What is the definitive management for this patient?

Accepted Answer

Lifelong DDAVP supplementation

Answer

No treatment required as receptors are upset

Answer

Thiazides for a limited duration of 2 weeks

Answer

DDAVP for a limited duration of 2 weeks

Question 8

A patient with diabetes mellitus for the past 5 years presents with vomiting and abdominal pain. She is non-compliant with medication and appears dehydrated. Investigations revealed a blood sugar value of 500 mg/dl and the presence of ketone bodies. What is the next best step in management of this patient?

Accepted Answer

Intravenous fluids with regular insulin

Answer

Intravenous fluids

Answer

Intravenous insulin

Answer

Intravenous fluids with long-acting insulin

Question 9

MC location of gastrinoma in MEN-1 syndrome?

Accepted Answer

Duodenum

Answer

Jejunum

Answer

Ileum

Answer

Pancreas

Question 10

Which of the following is not seen in MEN 2B syndrome?

Accepted Answer

Parathyroid adenoma

Answer

Mucosal neuroma

Answer

Marfanoid habitus

Answer

Megacolon

Endocrinology — MCQs

Endocrinology — MCQs

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