label: Nesidioblastosis
label_lc: nesidioblastosis
description: An abnormality of pancreatic beta cells characterized by a proliferation of abnormal beta cells throughout the entire pancreas, with enlarged islet size and number (hypertrophic islets), increased periductular islets, enlarged beta-cell nuclei and abundant clear cytoplasm. Occasionally beta cells with pleomorphic nuclei, ductuloinsular complexes, and neoformation of islets from ducts are observed.