title: Synovial sarcoma: an unexpected ultrasound finding in a post-partum patient.
abstract: A 20-year-old patient presented after an uneventful pregnancy and delivery with an asymptomatic soft-tissue mass behind her knee with the clinical features of a ganglion or Baker's cyst. An ultrasound scan demonstrated a well-defined but solid mass with prominent vascularity. The mass was noted to increase in size prior to surgery. The pathological diagnosis was that of a synovial sarcoma grade 2, a rare malignant mesenchymal neoplasm with a serious prognosis.
authors.affiliation: Department of Medical Imaging, Mercy Hospital for Women, East Melbourne, Victoria, Australia.
authors.forename: C M
authors.initials: CM
authors.lastname: Acton
authors.forename: W A
authors.initials: WA
authors.lastname: Morrison
authors.forename: J L
authors.initials: JL
authors.lastname: Slavin
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D007717:Knee / Q000000981:diagnostic imaging*; D049590:Postpartum Period; D011247:Pregnancy; D013584:Sarcoma, Synovial / Q000000981:diagnostic imaging* / Q000601:surgery; D012983:Soft Tissue Neoplasms / Q000000981:diagnostic imaging* / Q000601:surgery; D014463:Ultrasonography