title: Neuroendocrine (carcinoid) tumor of the mandible: a case report and review of the literature.
abstract: The aim of this article is to present a case of primary neuroendocrine tumor (typical carcinoid) of the mandible that occurred in a 46-year-old black woman who was seropositive for the human immunodeficiency virus. Radiologically the lesion presented as a poorly circumscribed honeycomb radiolucency that extended from tooth 21 to the ascending ramus. Histologically the tumor cells were variously arranged in small islands, trabeculae, follicles, and slitlike spaces lined by a single layer of palisaded low-columnar cells. The follicles contained an eosinophilic colloid-like substance. Immunocytochemical staining showed diffuse, intense positivity for MAK 6, pancytokeratin, S-100, and neuron-specific enolase and focal, intense, positive staining for chromogranin A. Electron microscopy showed the presence of interdigitating cell membranes, rudimentary cell attachments, and varying numbers of membrane-bound dense core granules. Special investigations failed to reveal a primary tumor, and no metastases were found. Urine and hematologic assessment did not show any evidence of functional activity. The tumor was resected, and no recurrence or spread has been seen for 2 years. Origin from foregut-derived, immature, and functionally uncommitted endocrine cells is presumed.
authors.affiliation: Faculty of Dentistry, University of the Witwatersrand, Johannesburg, South Africa.
authors.forename: H
authors.initials: H
authors.lastname: Coleman
authors.forename: M
authors.initials: M
authors.lastname: Kennedy
authors.forename: M
authors.initials: M
authors.lastname: Altini
authors.forename: J
authors.initials: J
authors.lastname: Crooks
authors.forename: P
authors.initials: P
authors.lastname: Tsakiris
mesh_terms: D002276:Carcinoid Tumor / Q000000981:diagnostic imaging / Q000473:pathology*; D019070:Cell Lineage; D002462:Cell Membrane / Q000648:ultrastructure; D053379:Chromogranin A; D002864:Chromogranins / Q000032:analysis; D003102:Colloids / Q000032:analysis; D003594:Cytoplasmic Granules / Q000648:ultrastructure; D004804:Eosinophils / Q000473:pathology; D005260:Female; D006679:HIV Seropositivity / Q000473:pathology*; D006801:Humans; D007150:Immunohistochemistry; D007425:Intracellular Membranes / Q000648:ultrastructure; D007633:Keratins / Q000032:analysis; D008339:Mandibular Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D008854:Microscopy, Electron; D008875:Middle Aged; D010751:Phosphopyruvate Hydratase / Q000032:analysis; D011859:Radiography; D009418:S100 Proteins / Q000032:analysis
chemical_list: D053379:Chromogranin A; D002864:Chromogranins; D003102:Colloids; D009418:S100 Proteins; D007633:Keratins; D010751:Phosphopyruvate Hydratase