title: Retroperitoneal malignant mesenchymoma: a case of mesenchymal mixed tumor with osteosarcoma, leiomyosarcoma, liposarcoma and fibrosarcoma.
abstract: Malignant mesenchymoma is an interesting but very rare tumor in which malignant differentiation has occurred twice or more. We report a case of retroperitoneal malignant mesenchymoma consisting of osteosarcoma, leiomyosarcoma, liposarcoma and fibrosarcoma. Abdominal CT showed a large retroperitoneal mass with two separate and distinct parts, namely an area of prominent calcification and one of clearly enhancing solid components. The mass contained histologically distinct tumorous components with no histologic admixure at the interfaces. The densely calcified nodule corresponded to osteosarcoma, and the noncalcified clearly enhancing nodules to leiomyosarcoma, liposarcoma and fibrosarcoma.
authors.affiliation: Department of Radiology, Holy Family Hospital, The Catholic University of Korea, Bucheon, Korea.
authors.forename: Jung Eun
authors.initials: JE
authors.lastname: Choi
authors.forename: Hong Jun
authors.initials: HJ
authors.lastname: Chung
authors.forename: Won Jong
authors.initials: WJ
authors.lastname: Yoo
authors.forename: Myung Hee
authors.initials: MH
authors.lastname: Chung
authors.forename: Mi Sook
authors.initials: MS
authors.lastname: Sung
authors.forename: Hae Giu
authors.initials: HG
authors.lastname: Lee
authors.forename: Il Young
authors.initials: IY
authors.lastname: Park
authors.forename: Jeana
authors.initials: J
authors.lastname: Kim
mesh_terms: D005354:Fibrosarcoma / Q000000981:diagnostic imaging*; D006801:Humans; D007890:Leiomyosarcoma / Q000000981:diagnostic imaging*; D008080:Liposarcoma / Q000000981:diagnostic imaging*; D008297:Male; D008637:Mesenchymoma / Q000000981:diagnostic imaging*; D008875:Middle Aged; D012516:Osteosarcoma / Q000000981:diagnostic imaging*; D012186:Retroperitoneal Neoplasms / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed