title: Pigmented villonodular synovitis of the hip mimicking soft-tissue sarcoma: a case report.
abstract: Pigmented villonodular synovitis is a rare and benign but potentially locally aggressive disease that should be considered in younger patients who present with monoarticular joint symptoms and pathology. We present a 30-year-old Sudanese woman with a huge mass arising from the right hip joint. A multimodality radiological approach to investigation and diagnosis is demonstrated and discussed. Histopathological examination of the resected specimen confirmed the diagnosis of pigmented villonodular synovitis with the mass consisting of a proliferation of fibrohistiocytic cells, abundant haemosiderin, foamy histiocytes, and occasional giant cells. The patient made a good recovery, with mobility aided by arm crutches and a hip abduction brace.
authors.affiliation: Department of Radiology, St Vincent's Hospital, Fitzroy, Melbourne, Australia. mkslee@optusnet.com.au
authors.forename: M Ks
authors.initials: MK
authors.lastname: Lee
authors.forename: P Fm
authors.initials: PF
authors.lastname: Choong
authors.forename: P J
authors.initials: PJ
authors.lastname: Smith
authors.forename: G J
authors.initials: GJ
authors.lastname: Powell
authors.forename: J L
authors.initials: JL
authors.lastname: Slavin
authors.forename: S M
authors.initials: SM
authors.lastname: Schlicht
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D005260:Female; D006621:Hip Joint; D006801:Humans; D007592:Joint Diseases / Q000175:diagnosis*; D012509:Sarcoma / Q000175:diagnosis*; D013586:Synovitis, Pigmented Villonodular / Q000175:diagnosis*