Endocrine Pancreatic Tumors

Endocrine pancreatic tumors, also known as pancreatic neuroendocrine tumors (PNETs), are rare neoplasms representing 1-2% of all pancreatic tumors that arise from islet cells and are classified as either functional (hormone-producing) or non-functional, with non-functional types being more common but presenting later due to mass effect rather than hormonal symptoms. The clinical significance lies in recognizing the distinct syndromes produced by functional tumors—insulinomas causing hypoglycemia, gastrinomas causing Zollinger-Ellison syndrome with refractory ulcers, glucagonomas with characteristic necrolytic migratory erythema, and VIPomas causing watery diarrhea—as well as understanding their association with genetic syndromes like MEN1, VHL, and tuberous sclerosis. Medical students must appreciate that early recognition of these characteristic clinical presentations, appropriate biochemical testing, and understanding of the WHO grading system based on Ki-67 index are essential for guiding management decisions ranging from surgical enucleation to medical therapy with somatostatin analogues and targeted therapies.