D2I2.
endocrine

Insulinoma

An insulinoma is a tumour of the that is derived from beta cells and secretes . It is a rare form of a tumour. Most insulinomas are in that they grow exclusively at their origin within the pancreas, but a minority . Insulinomas are one of the functional neuroendocrine tumour (PNET) group. In the Medical Subject Headings classification, insulinoma is the only subtype of "islet cell ".

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Plain-language summary adapted from Wikipedia. Not medical advice.