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a tumor of the beta cells of the islets of Langerhans; although usually benign, it is one of the chief causes of hypoglycemia.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


A well-differentiated pancreatic endocrine neoplasm associated with Whipple's triad:
(1) Symptoms and signs of hypoglycaemia;
(2) Concomitant plasma glucose level of 45 mg/dL or less; and
(3) Symptoms reverse with the administration of glucose. Amyloid is often found in insulinomas.

Insulinomas, especially if small, have an excellent prognosis.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


An islet cell adenoma that secretes insulin.
Synonym(s): insuloma.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
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