In Multiple Endocrine Neoplasia type 1 (MEN1), which gland is associated with Zollinger-Ellison syndrome?

• A. Pituitary gland
• B. Parathyroid gland
• C. Pancreas
• D. Adrenal gland

Answer: (C)

Zollinger-Ellison syndrome is characterized by gastrin-secreting tumors, known as gastrinomas, which lead to excessive gastric acid production and recurrent peptic ulcers. In the context of Multiple Endocrine Neoplasia type 1 (MEN1), the pancreas is the gland primarily associated with this syndrome.

In MEN1, individuals may develop gastrinomas, which are often found in the "gastrinoma triangle" formed by the duodenum, pancreas, and biliary tree. Thus, when discussing the gland associated with Zollinger-Ellison syndrome in MEN1, the pancreas is the correct choice, as these gastrinomas commonly originate from pancreatic tissue.

While the pituitary gland and parathyroid glands are involved in MEN1, they are associated with other endocrine tumors such as pituitary adenomas and hyperparathyroidism, but not directly with Zollinger-Ellison syndrome. The adrenal gland is also not linked to this syndrome in the context of MEN1. Therefore, the pancreas is vital in the pathology of Zollinger-Ellison syndrome within the framework of Multiple Endocrine Neoplasia type 1.