title: Large angioleiomyoma, rich of mast cell and sex hormone receptor expression.
abstract: BACKGROUND
  Angioleiomyoma is a rare benign solitary tumor, arising from the vascular smooth muscle. This tumor usually occurs in the subcutis of extremities, uncommonly in abdomen, often presents as a small (<2 cm) and is treated with excision.
  
  
  METHODS
  We report an extremely rare case of unusually large angioleiomyoma, first diagnosed as an ovarian tumor with some malignant possibilities by diagnostic imaging. We resected 1.7 kg of tumor from the extra-peritoneal cavity in the lower abdomen. Histological study revealed that this case's angioleiomyoma had abundant mast cells and sex hormone receptor expression.
  
  
  CONCLUSIONS
  This angioleiomyoma is not an obvious malignant tumor because of low mitosis, coagulative necrosis and cellular atypia. However, it seems to have low potential malignancy, because it has massive size, marked degeneration and abundant mast cells. There are some possibilities that sex hormones are related with the growth and degeneration of this case's tumor, because those receptors are strongly expressed in the nucleus of tumor cells.
authors.affiliation: Department of Obstetrics and Gynecology, Dokkyo Medical University, Kitakobayashi 880, Mibu, Tochigi, Japan. ma-haya@dokkyomed.ac.jp
authors.forename: Masaru
authors.initials: M
authors.lastname: Hayashi
authors.forename: Shigeki
authors.initials: S
authors.lastname: Tomita
authors.forename: Ichio
authors.initials: I
authors.lastname: Fukasawa
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Inaba
mesh_terms: D000008:Abdominal Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D000328:Adult; D018229:Angiomyoma / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008279:Magnetic Resonance Imaging; D008407:Mast Cells / Q000473:pathology*; D049268:Positron-Emission Tomography; D011960:Receptors, Estrogen / Q000032:analysis*; D011980:Receptors, Progesterone / Q000032:analysis*; D014057:Tomography, X-Ray Computed
chemical_list: D011960:Receptors, Estrogen; D011980:Receptors, Progesterone