Pancreatic nesidioblastosis in adults. Report of a patient with hyperinsulinemic hypoglycemia.

Hyperinsulinemic hypoglycemia in neonates occurs most commonly secondary to nesidioblastosis, a persistence of fetal development of the endocrine cells of the pancreas. In adults, hyperinsulinemic hypoglycemia is usually due to insulinoma or beta-cell hyperplasia. Nesidioblastosis arising in adults has only recently been reported.