title: Ewing's Sarcoma of the Peritoneum: a Rare Location for Extraskeletal Ewing's Sarcoma.
abstract: A 38-year-old male presented to the emergency department with abdominal pain and bulge. He had a history of irritable bowel syndrome for 1 year with complaint of dyspepsia. Physical examination revealed a distended abdomen with a huge palpable mass located in the paraumblical region. Laboratory findings revealed a high white blood cell count with neutrophil predominance. Contrast-enhanced computed tomography (CT) showed a 23-cm, oval-shaped, grossly necrotic, low-attenuation mass with peripherally located dominant vessels. Magnetic resonance imaging (MRI) with diffusion weighted imaging (DWI) suggested a highly malignant tumor with prominent diffusion restriction especially at the periphery of the mass. On surgery, macroscopic examination showed a macrolobulated, hypervascular, reddish brown mass attached to the parietal peritoneum with a stalk. Ewing's sarcoma (ES) was diagnosed on histopathological examination with small round cells.
authors.affiliation: Department of Radiology, GATA Haydarpasa Training Hospital, Uskudar, Istanbul, 34668, Turkey. mzsaglam@yahoo.com.
authors.forename: Muzaffer
authors.initials: M
authors.lastname: Saglam
authors.affiliation: Department of General Surgery, GATA Haydarpasa Training Hospital, Uskudar, Istanbul, 34668, Turkey.
authors.forename: Yavuz
authors.initials: Y
authors.lastname: Ozdemir
authors.affiliation: Department of General Surgery, GATA Haydarpasa Training Hospital, Uskudar, Istanbul, 34668, Turkey.
authors.forename: Taner
authors.initials: T
authors.lastname: Yigit
authors.affiliation: Department of Pathology, GATA Haydarpasa Training Hospital, Uskudar, Istanbul, 34668, Turkey.
authors.forename: Zafer
authors.initials: Z
authors.lastname: Kucukodaci
authors.affiliation: Department of Radiology, GATA Haydarpasa Training Hospital, Uskudar, Istanbul, 34668, Turkey.
authors.forename: Guner
authors.initials: G
authors.lastname: Sonmez
mesh_terms: D000328:Adult; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D010534:Peritoneal Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology*; D012512:Sarcoma, Ewing / Q000000981:diagnostic imaging* / Q000473:pathology*; D014057:Tomography, X-Ray Computed
keywords: Diffusion weighted imaging; Extraskeletal Ewing’s sarcoma; Parietal peritoneum