Abdominal neuroendocrine neoplasm with misplaced exocytosis.
A 22-year-old man presented with epigastric fullness and tenderness. A 14-cm mass that was adherent to the sigmoid colon was removed surgically. The tumor exhibited ultrastructural evidence of neuroendocrine differentiation but defied precise classification. The tumor exhibited misplaced exocytosis, a finding not previously described in neuroendocrine tumors other than prolactin cell adenomas.
Tucker
J A
JA
Department of Pathology, University of South Alabama, Mobile 36617.
D000008:Abdominal Neoplasms / Q000503:physiopathology / Q000648:ultrastructure*; D000328:Adult; D018278:Carcinoma, Neuroendocrine / Q000503:physiopathology / Q000648:ultrastructure*; D005089:Exocytosis / Q000502:physiology*; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008854:Microscopy, Electron