title: Extraskeletal osteosarcoma in the thigh: a case report.
abstract: Extraskeletal osteosarcoma is a rare malignant soft-tissue tumor. There are few reports describing the radiological findings of this tumor, especially concerning its MRI and scintigraphic appearance. We report a 58-year-old man with extraskeletal osteosarcoma in the thigh. Radiographs showed small foci of mineralization in the mass. The tumor showed low intensity on T1-weighted images and predominantly high intensity on T2-weighted images, and the tumor was heterogeneously well enhanced on Gd-DTPA-enhanced T1-weighted images. Bone scintigraphy showed extraskeletal uptake in the tumor, and thallium-201 scintigraphy revealed marked inhomogeneous accumulation.
authors.affiliation: Department of Radiology, Ehime University School of Medicine, Toon, Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Kajihara
authors.forename: Yoshifumi
authors.initials: Y
authors.lastname: Sugawara
authors.forename: Masaaki
authors.initials: M
authors.lastname: Hirata
authors.forename: Keiichi
authors.initials: K
authors.lastname: Kikuchi
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Miki
authors.forename: Teruhito
authors.initials: T
authors.lastname: Mochizuki
authors.forename: Kenshi
authors.initials: K
authors.lastname: Sakayama
authors.forename: Teruki
authors.initials: T
authors.lastname: Kidani
authors.forename: Tatsuhiko
authors.initials: T
authors.lastname: Miyazaki
mesh_terms: D003287:Contrast Media; D019786:Gadolinium DTPA; D006801:Humans; D007089:Image Enhancement; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D012516:Osteosarcoma / Q000175:diagnosis* / Q000473:pathology; D019275:Radiopharmaceuticals; D012983:Soft Tissue Neoplasms / Q000175:diagnosis* / Q000473:pathology; D013669:Technetium Tc 99m Medronate / Q000031:analogs & derivatives*; D013794:Thallium Radioisotopes; D013848:Thigh / Q000473:pathology*
chemical_list: D003287:Contrast Media; D019275:Radiopharmaceuticals; D013794:Thallium Radioisotopes; C024226:technetium Tc 99m hydroxymethylene diphosphonate; D019786:Gadolinium DTPA; D013669:Technetium Tc 99m Medronate