title: Undifferentiated embryonal sarcoma of the liver presenting as a hemorrhagic cystic tumor in an adult.
abstract: BACKGROUND
  Undifferentiated embryonal sarcoma (UES) of the liver is a rare, highly malignant neoplasm with a poor prognosis occurring almost exclusively in late childhood (6-10 years of age). Only a few cases have been reported in adults, accounting for less than 1% of all primary liver neoplasms.
  
  
  METHODS
  A 47-year-old woman presented with a palpable mass in the left upper abdomen. Magnetic resonance imaging revealed a 12x10 cm cystic mass with hemorrhage in the left lateral segment of the liver. The initial impression was a hemorrhagic cystic tumor of the liver. The patient underwent a left lateral sectionectomy of the liver. Histopathology and immunohistochemistry helped make a diagnosis of UES.
  
  
  RESULTS
  The patient recovered uneventfully and received systemic chemotherapy. Radiologic examination for follow-up revealed a metastatic lesion in the lumbar spine (L5). She was subjected to radiotherapy at the lumbar spine. She survived 48 months.
  
  
  CONCLUSIONS
  Although hepatic cyst as UES of the liver is difficult to diagnose because of its rarity in adults and lack of specific findings, it should be considered in a differential diagnosis.
authors.affiliation: Department of Surgery, Chonnam National University Medical School, Gwangju, Korea.
authors.forename: Ho Hyun
authors.initials: HH
authors.lastname: Kim
authors.forename: Jung Chul
authors.initials: JC
authors.lastname: Kim
authors.forename: Eun Kyu
authors.initials: EK
authors.lastname: Park
authors.forename: Young Hoe
authors.initials: YH
authors.lastname: Hur
authors.forename: Yang Seok
authors.initials: YS
authors.lastname: Koh
authors.forename: Chol Kyoon
authors.initials: CK
authors.lastname: Cho
authors.forename: Hyung Seok
authors.initials: HS
authors.lastname: Kim
authors.forename: Hyun Jong
authors.initials: HJ
authors.lastname: Kim
mesh_terms: D001706:Biopsy; D003560:Cysts / Q000175:diagnosis*; D003937:Diagnosis, Differential; D005260:Female; D005500:Follow-Up Studies; D006470:Hemorrhage / Q000175:diagnosis*; D006498:Hepatectomy; D006801:Humans; D008113:Liver Neoplasms / Q000175:diagnosis* / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D009373:Neoplasms, Germ Cell and Embryonal / Q000175:diagnosis* / Q000601:surgery; D049268:Positron-Emission Tomography; D012509:Sarcoma / Q000175:diagnosis* / Q000601:surgery; D014057:Tomography, X-Ray Computed