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Medical Term:

islet cell tumor


Definition: an endocrine tumor composed of cells equivalent or related to those in the normal islet of Langerhans; may be benign or malignant; usually hormonally active; comprises insulinomas, glucagonomas, vipomas, somatostatinomas, gastrinomas, pancreatic polypeptide-secreting tumor, and multihormonal or hormonally inactive pancreatic islet cell tumors.