title: Hemangiopericytoma of the esophagus.
abstract: A case of hemangiopericytoma arising in the esophagus is described. The light microscopic features were typical, and ultrastructural examination confirmed the presence of pericyte-like cells and excluded smooth muscle and fibroblastic differentiation. Areas of necrosis and a focus of mitotic activity within the tumor suggested the possibility of an uncertain future course.
mesh_terms: D000328:Adult; D004938:Esophageal Neoplasms / Q000473:pathology* / Q000648:ultrastructure; D004947:Esophagus / Q000648:ultrastructure; D006393:Hemangiopericytoma / Q000473:pathology* / Q000648:ultrastructure; D006801:Humans; D008297:Male