title: Deep soft-tissue leiomyoma of the popliteal fossa in a 14-year-old girl.
abstract: This is the first case report of a deep soft-tissue leiomyoma with intraarticular localization within the knee joint. A 14-year-old girl presented with a painless mass in the dorsal aspect of her knee which she had noticed some 9 months earlier. While on plain radiographs no bony lesions were visible, magnetic resonance imaging (MRI) revealed an intraarticularly located tumor with well-defined margins. Intraoperatively, the tumor was found adjacent to the posterior cruciate ligament. The final diagnosis was established immunohistologically. Although this is a very rare tumor, it has to be considered in the differential diagnosis for soft-tissue swellings of the popliteal fossa.
authors.affiliation: Department of Orthopaedics, University Hospital, Aachen, Germany. bernhard.schmidt@post.rwth-aachen.de
authors.forename: B
authors.initials: B
authors.lastname: Schmidt-Rohlfing
authors.forename: L
authors.initials: L
authors.lastname: Tietze
authors.forename: C H
authors.initials: CH
authors.lastname: Siebert
authors.forename: G
authors.initials: G
authors.lastname: Staatz
mesh_terms: D000293:Adolescent; D005260:Female; D006801:Humans; D007592:Joint Diseases / Q000175:diagnosis / Q000473:pathology; D007719:Knee Joint; D007889:Leiomyoma / Q000175:diagnosis* / Q000473:pathology; D008279:Magnetic Resonance Imaging; D012983:Soft Tissue Neoplasms / Q000175:diagnosis* / Q000473:pathology