title: Case report 829: Intramuscular myxoid chondrosarcoma.
abstract: A 61-year-old man presented with a 6-month history of a painless mass in the right buttock. Although the MR appearance of myxoid neoplasms is variable, a myxoid neoplasm was suspected on the basis of the MR study. Percutaneous needle biopsy results yielded a diagnosis of intramuscular myxoma. Myxoid chondrosarcoma, however, was diagnosed at the time of excisional biopsy. One should be wary of a diagnosis of intramuscular myxoma based solely on the results of percutaneous needle biopsy. In addition, myxoid chondrosarcoma of the soft tissues can have a variable appearance on T1-weighted imaging.
authors.affiliation: Department of Radiology, University of Iowa, College of Medicine, Iowa City.
authors.forename: C G
authors.initials: CG
authors.lastname: Whitten
authors.forename: G Y
authors.initials: GY
authors.lastname: el-Khoury
authors.forename: J A
authors.initials: JA
authors.lastname: Benda
authors.forename: S
authors.initials: S
authors.lastname: Ehara
mesh_terms: D002081:Buttocks; D002813:Chondrosarcoma / Q000175:diagnosis*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009132:Muscles / Q000473:pathology*; D009135:Muscular Diseases / Q000175:diagnosis; D009232:Myxoma / Q000175:diagnosis; D012983:Soft Tissue Neoplasms / Q000175:diagnosis*