<unk>  is the second most common functional pancreatic neuroendocrine tumor (pNET), with a yearly incidence of approximately 0.5 to 21.5 cases per a million of people worldwide.<unk> s are located predominantly in the duodenum (70%) and pancreas (25%). Pancreatic<unk> s are larger than their duodenal counterparts, may occur in any portion of the pancreas, and comprise 25% of these tumors.<unk> s are also the most common functional and malignant pancreatic endocrine tumors. They are characterized by gastric hypersecretion that results in peptic ulcers and diarrhea; this condition is known as Zollinger–Ellison syndrome (ZES).
Gastrinoma
Glomus tumor
Somatostatinoma
VIPoma
Glucagonoma
Ceruminous adenoma
Insulinoma
Nipple adenoma