title: MR imaging of malignant mesenchymal tumors of the liver.
abstract: Magnetic resonance (MR) features of five primary malignant mesenchymal neoplasms (plasmocytoma, leiomyosarcoma, undifferentiated sarcoma, epithelioid hemangioendothelioma, and angiosarcoma) of the liver were reported. All tumors were hypointense on T1-weighted images and hyperintense on T2-weighted images. No halo and intravenous extension were noted. A target appearance was revealed in epithelioid hemangioendothelioma. MR findings of angiosarcoma were essentially the same as those of cavernous hemangiomas (markedly hyperintense with hypointense linear septa on T2-weighted images). MR findings of these rare hepatic malignancies were nonspecific, although they were quite different from those of typical hepatocellular carcinomas. This study suggested that MR differentiation of primary hepatic mesenchymal tumors from other common benign and malignant neoplasms was difficult; however, the number of studied cases was limited.
authors.affiliation: Department of Radiology, Yamanashi Medical College, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Ohtomo
authors.forename: T
authors.initials: T
authors.lastname: Araki
authors.forename: Y
authors.initials: Y
authors.lastname: Itai
authors.forename: S
authors.initials: S
authors.lastname: Monzawa
authors.forename: H
authors.initials: H
authors.lastname: Ohba
authors.forename: Y
authors.initials: Y
authors.lastname: Nogata
authors.forename: T
authors.initials: T
authors.lastname: Hihara
authors.forename: K
authors.initials: K
authors.lastname: Koizumi
authors.forename: G
authors.initials: G
authors.lastname: Uchiyama
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003937:Diagnosis, Differential; D005260:Female; D006390:Hemangioendothelioma / Q000175:diagnosis*; D006394:Hemangiosarcoma / Q000175:diagnosis; D006801:Humans; D007890:Leiomyosarcoma / Q000175:diagnosis; D008113:Liver Neoplasms / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D010954:Plasmacytoma / Q000175:diagnosis*; D012509:Sarcoma / Q000175:diagnosis*