Most common pancreatic tumor in MEN-I is –
**Core Concept**
The Multiple Endocrine Neoplasia Type 1 (MEN-I) syndrome is characterized by the occurrence of tumors in multiple endocrine glands, including the pancreas. The syndrome is caused by mutations in the MEN1 gene, leading to the development of tumors in these glands.
**Why the Correct Answer is Right**
The most common pancreatic tumor in MEN-I is a gastrinoma, which is a type of neuroendocrine tumor (NET). Gastrinomas produce excessive amounts of gastrin, a hormone that stimulates the secretion of gastric acid. This leads to the development of peptic ulcers and other complications. The gastrinomas in MEN-I are often found in the duodenum, but can also occur in the pancreas.
**Why Each Wrong Option is Incorrect**
* **Option A:** Insulinoma is a type of pancreatic NET that produces insulin, but it is not the most common tumor in MEN-I.
* **Option B:** Glucagonoma is another type of pancreatic NET that produces glucagon, but it is not typically associated with MEN-I.
* **Option C:** Pancreatic adenocarcinoma is a type of exocrine tumor that is not typically associated with MEN-I.
**Clinical Pearl / High-Yield Fact**
In MEN-I, the presence of a gastrinoma can be diagnosed by measuring fasting gastrin levels, which are typically elevated in these patients. A gastrin level of > 200 pg/mL is highly suggestive of gastrinoma.
**Correct Answer: A. Gastrinoma. Gastrinoma**