title: Primary liposarcoma of the ascending colon: a rare case of mixed type presenting as hemoperitoneum combined with other type of retroperitoneal liposarcoma.
abstract: BACKGROUND
  Liposarcoma occurs most commonly in the extremities and retroperitoneum, however, it has been rarely observed in the colon.
  
  
  METHODS
  A case is reported a 41-year-old man with liposarcoma of ascending colon which was presented as hemoperitoneum and combined with a different histological type of retroperitoneal liposarcoma. He visited hospital with right lower abdominal pain and palpable mass. Laboratory data including tumor markers were within normal limits, and computed tomography revealed a 15 x 10 cm sized enhancing soft mass. Right hemicolectomy was performed, and after that, a further large retroperitoneal mass was revealed and this was also radically excised. Mixed-type colon liposarcoma and well differentiated type of retroperitoneal liposarcoma were diagnosed in pathologic report. The patient has remained free of disease for 24 months.
  
  
  CONCLUSIONS
  No standardized guidelines have been established for its treatment because too small a number of cases have been reported, but surgical resection was considered the treatment of choice.
authors.affiliation: Department of Surgery, Soonchunhyang University College of Medicine, Seoul, Korea.
authors.forename: Yoon Young
authors.initials: YY
authors.lastname: Choi
authors.forename: Yong Jin
authors.initials: YJ
authors.lastname: Kim
authors.forename: So Young
authors.initials: SY
authors.lastname: Jin
mesh_terms: D015746:Abdominal Pain / Q000209:etiology; D000328:Adult; D001706:Biopsy; D002454:Cell Differentiation; D003082:Colectomy; D003110:Colonic Neoplasms / Q000150:complications* / Q000175:diagnosis / Q000601:surgery; D006465:Hemoperitoneum / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery; D006801:Humans; D007150:Immunohistochemistry; D008080:Liposarcoma / Q000150:complications* / Q000175:diagnosis / Q000601:surgery; D008297:Male; D009378:Neoplasms, Multiple Primary; D012186:Retroperitoneal Neoplasms / Q000150:complications* / Q000175:diagnosis / Q000601:surgery; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome