title: Synovial chondroma of the ankle in a young child after recent trauma: CT and MR features.
abstract: We report a case of synovial chondroma of the left ankle in an 11-year-old boy presenting with soft tissue swelling after recent trauma. The noncalcified or nonossified intraarticular chondroma arising from metaplastic synovium has characteristic imaging appearance on computed tomography (CT) and magnetic resonance imaging (MRI). A lobulated mass of fluid-like density and signal intensity along with internal septa are characteristic features on CT and MRI. The knowledge of CT and MRI features of noncalcified or nonossified synovial chondroma is important to distinguish from the simple or complicated effusion, hemarthrosis, or other synovial process.
authors.affiliation: Department of Radiology, Tri-Service General Hospital, National Defense Medical Center 325 Sec. 2, Neihu 114, Cheng-Kung Road, Taipei, Taiwan, ROC.
authors.forename: C J
authors.initials: CJ
authors.lastname: Hsueh
authors.forename: G S
authors.initials: GS
authors.lastname: Huang
authors.forename: C J
authors.initials: CJ
authors.lastname: Juan
authors.forename: S G
authors.initials: SG
authors.lastname: Wang
authors.forename: C H
authors.initials: CH
authors.lastname: Liou
authors.forename: H S
authors.initials: HS
authors.lastname: Hsiao
authors.forename: H W
authors.initials: HW
authors.lastname: Gao
mesh_terms: D016512:Ankle Injuries / Q000150:complications*; D000843:Ankle Joint / Q000000981:diagnostic imaging / Q000473:pathology; D002648:Child; D015838:Chondromatosis, Synovial / Q000175:diagnosis* / Q000209:etiology; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D014057:Tomography, X-Ray Computed