Pancreatic Endocrine Disorders — MCQs
VIPoma is associated with which syndrome?
Which condition is most commonly associated with systemic amyloidosis?
A patient presents with large sweaty hands, macroglossia, and frontal bossing. What is the best test for confirmation of the diagnosis?
A 45-year-old gentleman has undergone truncal vagotomy and pyloroplasty for bleeding duodenal ulcer seven years ago. Now he has intractable recurrent symptoms of peptic ulcer. All of the following suggest the diagnosis of Zollinger-Ellison syndrome, except:
Marker for pancreatic non-functional neuro-endocrine tumor is
Which of the following is the MOST characteristic feature of insulinoma?
Which is the most common pancreatic endocrine neoplasm?
What is the most common thyroid tumor associated with multiple endocrine neoplasia (MEN)?
The most common cause of early spontaneous abortion is:
Which of the following is the most common cause of a mixed cystic and solid suprasellar mass seen on cranial MR scan of a 10-year-old child:
Pancreatic Endocrine Disorders Indian Medical PG Practice Questions and MCQs
Question 1: VIPoma is associated with which syndrome?
- A. Cushing's syndrome
- B. Verner-Morrison syndrome (Correct Answer)
- C. Carcinoid syndrome (serotonin syndrome)
- D. Zollinger-Ellison syndrome
Explanation: ***Verner-Morrison syndrome*** - **VIPoma** is a neuroendocrine tumor that secretes **vasoactive intestinal peptide (VIP)**, causing symptoms like watery diarrhea, hypokalemia, and achlorhydria (WDHA syndrome) [1]. - This clinical presentation is also known as **Verner-Morrison syndrome**, directly linking the VIPoma to this syndrome [1]. *Cushing's syndrome* - Characterized by excessive **cortisol** production, leading to symptoms like central obesity, moon facies, and hypertension [3]. - This syndrome is not directly associated with VIP excess or the watery diarrhea seen in VIPoma [2]. *Carcinoid syndrome (serotonin syndrome)* - Caused by tumors, typically in the gastrointestinal tract, that produce **serotonin**, leading to flushing, diarrhea, and bronchospasm [1]. - While it involves diarrhea, the primary mediator is serotonin, not VIP, and the other classic VIPoma symptoms (hypokalemia, achlorhydria) are absent [1]. *Zollinger-Ellison syndrome* - Characterized by a **gastrin-producing tumor (gastrinoma)**, which causes excessive gastric acid secretion and severe peptic ulcer disease [4]. - The hormonal excess is **gastrin**, not VIP, and symptoms are related to acid overproduction rather than massive watery diarrhea and hypokalemia [4].
Question 2: Which condition is most commonly associated with systemic amyloidosis?
- A. Chronic Kidney Disease (Correct Answer)
- B. Multiple Myeloma
- C. Rheumatoid Arthritis
- D. Familial Mediterranean Fever
Explanation: Type II DM - Amyloidosis is commonly associated with **chronic diseases** like type II diabetes mellitus due to insulin resistance leading to amyloid deposition [4]. - The presence of **amiloid in the pancreas** often correlates with the complications of this type of diabetes [3]. *Maturity onset DM* - While maturity-onset diabetes can lead to complications, it is often synonymous with **type II DM**, making this distinction inaccurate regarding amyloidosis. - This term is less commonly used and does not emphasize the direct link to amyloidosis seen in type II diabetes. *HTN* - Hypertension itself is not a direct cause of amyloidosis; it typically results from other underlying conditions. - The association of amyloidosis with hypertension is usually **secondary**, not a primary condition leading to amyloid deposits [2]. *Type I DM* - Type I diabetes is primarily **autoimmune**, resulting in insulin-deficient states and does not strongly associate with amyloidosis like type II [1]. - The amyloid deposits seen in type I are much less common compared to type II or associated chronic conditions.
Question 3: A patient presents with large sweaty hands, macroglossia, and frontal bossing. What is the best test for confirmation of the diagnosis?
- A. GHRH levels
- B. IGF-1 (Correct Answer)
- C. IGF-2
- D. GH levels after glucose suppression
- E. Random GH level
Explanation: ***IGF-1*** - Elevated **IGF-1 (Insulin-like Growth Factor 1)** is the most reliable screening test for acromegaly, reflecting integrated GH secretion over time. - The clinical signs of **large sweaty hands**, **macroglossia**, and **frontal bossing** are classic symptoms of acromegaly, caused by excessive growth hormone (GH) production, which then stimulates IGF-1. *GHRH levels* - **Growth hormone-releasing hormone (GHRH)** levels are typically only measured when investigating ectopic GHRH production as a rare cause of acromegaly, which is not the primary diagnostic step. - While GHRH stimulates GH, its direct measurement is not the standard initial diagnostic test for suspected pituitary-driven acromegaly. *IGF-2* - **IGF-2 (Insulin-like Growth Factor 2)** plays a role in fetal growth and certain tumor-related syndromes, but it is not the primary mediator or diagnostic marker for acromegaly in adults. - IGF-1, not IGF-2, is the main growth factor responsible for the anabolic effects of growth hormone. *GH levels after glucose suppression* - Measuring **GH levels after glucose suppression** (oral glucose tolerance test with 75g glucose) is a confirmatory test for acromegaly, used when IGF-1 levels are equivocal or borderline. - In healthy individuals, glucose suppresses GH secretion to <1 ng/mL, but in acromegaly, GH levels remain elevated (failure to suppress), confirming autonomous GH hypersecretion. *Random GH level* - **Random GH levels** are unreliable for diagnosing acromegaly due to the pulsatile nature of GH secretion, with significant variation throughout the day. - A single normal GH level does not exclude acromegaly, and a single elevated level can occur in healthy individuals during normal secretory peaks, making it inadequate as a diagnostic test.
Question 4: A 45-year-old gentleman has undergone truncal vagotomy and pyloroplasty for bleeding duodenal ulcer seven years ago. Now he has intractable recurrent symptoms of peptic ulcer. All of the following suggest the diagnosis of Zollinger-Ellison syndrome, except:
- A. Ulcers in proximal jejunum and lower end of esophagus
- B. Basal acid output of 15 meq/hour
- C. Serum gastrin value of 500 pg/ml
- D. Serum gastrin value of 200 pg/ml with secretin stimulation (Correct Answer)
Explanation: ***Serum gastrin value of 200 pg/ml with secretin stimulation*** - A **positive secretin stimulation test** for Zollinger-Ellison syndrome (ZES) is indicated by a rise in serum gastrin of **≥ 200 pg/mL (or 110 pg/mL depending on the reference range)** above baseline after secretin administration. - A value of 200 pg/ml with secretin stimulation is not diagnostic if the baseline is not known or if the rise from baseline is not significant (i.e., less than 200 pg/ml absolute rise or less than 110 pg/ml rise depending on the specific criteria used). In the context of the other options, this relatively lower value is the *least* indicative of ZES. *Basal acid output of 15 meq/hour* - In a patient with prior vagotomy, a **basal acid output (BAO) of 15 meq/hour** is significantly elevated and highly suggestive of Zollinger-Ellison syndrome, as vagotomy aims to reduce acid secretion. - Normal BAO is typically < 5 mEq/hr, and a BAO > 15 mEq/hr (or > 6 mEq/hr in patients who have undergone prior acid-reducing surgery) is strongly indicative of excessive gastric acid production characteristic of ZES [1]. *Serum gastrin value of 500 pg/ml* - A **fasting serum gastrin level of 500 pg/ml** is markedly elevated (> 150-200 pg/mL is often considered suspicious), especially in the presence of recurrent ulcers, and is a strong indicator for Zollinger-Ellison syndrome [1]. - This value is well above the normal range (typically < 100 pg/ml) and falls into the range where gastrinoma should be highly suspected [1]. *Ulcers in proximal jejunum and lower end of esophagus* - The presence of **ulcers in unusual locations** such as the **proximal jejunum** is highly characteristic of Zollinger-Ellison syndrome due to the profound acid hypersecretion. - Esophageal ulcers, particularly at the lower end, are also common due to severe gastroesophageal reflux caused by high acid output overwhelming esophageal protective mechanisms.
Question 5: Marker for pancreatic non-functional neuro-endocrine tumor is
- A. CEA
- B. PSA
- C. CD100
- D. Chromogranin-A (Correct Answer)
Explanation: ***Chromogranin-A*** - **Chromogranin-A** is a glycoprotein found in the neurosecretory granules of various neuroendocrine cells, making it a reliable **general neuroendocrine tumor marker** [1]. - Elevated levels are particularly useful for detecting and monitoring **pancreatic non-functional neuroendocrine tumors**, which often lack specific hormonal symptoms. *CEA* - **Carcinoembryonic antigen (CEA)** is primarily used as a tumor marker for **colorectal cancer**, and less commonly for other adenocarcinomas like pancreatic adenocarcinoma. - It is generally **not a specific marker** for neuroendocrine tumors. *PSA* - **Prostate-specific antigen (PSA)** is a specific marker for **prostate cancer**, used for screening, diagnosis, and monitoring of this particular malignancy. - It has **no relevance** in the diagnosis or monitoring of pancreatic neuroendocrine tumors. *CD100* - **CD100** (also known as semaphorin-4D) is a membrane glycoprotein involved in immune cell regulation and has been implicated in certain cancers, such as those of **hematopoietic origin**. - It is **not used as a marker** for pancreatic non-functional neuroendocrine tumors. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 780-781.
Question 6: Which of the following is the MOST characteristic feature of insulinoma?
- A. Hypoglycemic attacks (Correct Answer)
- B. Usually Solitary tumour
- C. Mostly benign tumour
- D. Weight gain
Explanation: Hypoglycemic attacks - **Insulinoma** is a tumor of the pancreatic beta cells that secretes excessive insulin, leading to recurrent episodes of **hypoglycemia** [1]. - These attacks often occur during fasting or after exercise and are relieved by glucose intake [2]. Weight gain - While patients with insulinoma may experience some **weight gain** due to increased caloric intake to prevent hypoglycemic symptoms, it is not the most defining or characteristic feature. - Weight gain is a non-specific symptom that can be associated with many other conditions. Usually Solitary tumour - While many insulinomas are solitary (about 90%), this is a pathological characteristic rather than a clinical feature. - The patient's presentation is dominated by the **functional consequences** of insulin overproduction. Mostly benign tumour - Approximately 90% of insulinomas are benign, but this is a pathological classification. - The most characteristic clinical manifestation from a patient's perspective remains the recurrent **hypoglycemia** caused by excessive insulin secretion.
Question 7: Which is the most common pancreatic endocrine neoplasm?
- A. Insulinoma (Correct Answer)
- B. Gastrinoma
- C. VIPoma
- D. Glucagonoma
Explanation: ***Insulinoma*** - It is the **most common pancreatic endocrine neoplasm**, characterized by excessive insulin production leading to hypoglycemia. - Most patients present with **symptoms of hypoglycemia**, such as sweating, confusion, and palpitations due to overproduction of insulin [1]. *Gastrinoma* - Generally implicated in **Zollinger-Ellison syndrome**, it causes excessive gastric acid secretion, leading to severe ulcers but is less common than insulinoma. - Associated with **diarrhea and abdominal pain**, not typically causing hypoglycemia [1]. *Glucagonoma* - Rarely seen, it causes **hyperglycemia** and characteristic **necrotizing migratory erythema**, rather than hypoglycemic episodes. - Comprises a minority of pancreatic endocrine tumors and is not the most common type. *VIPoma* - Produces **vasoactive intestinal peptide**, leading to profuse watery diarrhea and severe electrolyte imbalance. - It is uncommon compared to insulinoma and primarily causes gastrointestinal symptoms rather than hypoglycemia.
Question 8: What is the most common thyroid tumor associated with multiple endocrine neoplasia (MEN)?
- A. Follicular
- B. Papillary
- C. Anaplastic
- D. Medullary (Correct Answer)
Explanation: ***Medullary*** - The **commonest thyroid tumor** in Multiple Endocrine Neoplasia (MEN) type 2 is medullary thyroid carcinoma, associated with **calcitonin production** [1]. - It arises from **C cells (parafollicular cells)** and is linked to **RET oncogene mutations** in MEN syndromes [1]. *Papillary* - Papillary thyroid carcinoma is the **most common thyroid cancer overall**, but not specifically associated with MEN syndromes. - It typically presents with **lymphatic spread**, whereas medullary carcinoma has a different genetic association. *Follicular* - Follicular thyroid carcinoma is less common in MEN and usually occurs sporadically. - It primarily arises from **follicular cells** and involves a different mechanism than medullary carcinoma. *Anaplastic* - Anaplastic thyroid carcinoma is a rare and highly aggressive form, not commonly associated with MEN. - It usually arises from **differentiated thyroid cancers** and presents in older patients, which does not align with MEN's typical presentations. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, pp. 1102-1103.
Question 9: The most common cause of early spontaneous abortion is:
- A. Teratogens
- B. Endocrine disorder
- C. Infection
- D. Chromosomal abnormality (Correct Answer)
Explanation: ***Chromosomal abnormality*** - **Chromosomal abnormalities**, such as aneuploidy (e.g., trisomy, monosomy), are responsible for approximately 50-70% of all **early spontaneous abortions**. - These abnormalities often result in **non-viable embryos** or fetuses, leading to pregnancy loss before 12-20 weeks of gestation. *Teratogens* - **Teratogens** are agents that can cause birth defects, but they are a less common cause of **early spontaneous abortion** compared to chromosomal abnormalities. - While they can lead to fetal demise, their primary impact is often on **fetal development** rather than embryonic non-viability. *Endocrine disorder* - **Endocrine disorders** like uncontrolled diabetes or thyroid disease can increase the risk of spontaneous abortion, but they are not the **most common cause**. - These factors tend to contribute to a smaller percentage of **early pregnancy losses** compared to genetic errors. *Infection* - Certain **infections** (e.g., TORCH infections, bacterial vaginosis) can cause spontaneous abortion, especially if systemic or severe. - However, similar to endocrine disorders, infections are a less frequent cause of **early spontaneous abortion** than chromosomal abnormalities.
Question 10: Which of the following is the most common cause of a mixed cystic and solid suprasellar mass seen on cranial MR scan of a 10-year-old child:
- A. Optic chiasma glioma
- B. Pituitary Adenoma
- C. Craniopharyngioma (Correct Answer)
- D. Germinoma
Explanation: ***Craniopharyngioma*** * **Craniopharyngiomas** are the most common cause of a mixed cystic and solid suprasellar mass in children, often presenting with calcifications. * These tumors typically arise from Rathke's pouch remnants and can cause symptoms related to **pituitary dysfunction** and **visual field defects**. *Optic chiasma glioma* * **Optic chiasma gliomas** usually present as solid masses, although they can sometimes have cystic components. * They are more commonly associated with **Neurofibromatosis type 1** and primarily cause visual symptoms. *Pituitary Adenoma* * **Pituitary adenomas** are rare in children and typically present as purely solid masses, although cystic degeneration can occur. * They are more common in adults and often cause symptoms of **hormonal overproduction** or hypopituitarism. *Germinoma* * **Germinomas** are usually solid and homogenously enhancing tumors, sometimes with small cystic areas. * They are frequently located in the **pineal region** or suprasellar region and can cause hydrocephalus or endocrine dysfunction.
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