title: Not such a simple cyst: unusual presentation of sarcoma.
abstract: A 10-year-old girl presented with a lump on her left upper anterior thigh. She presented to accident and emergency twice and to her general practitioner once. It was provisionally diagnosed as a cyst but it continued to grow in size. The lump had been noticed for 6 months, in paediatric clinic it was 5×5 cm, firm, tense and felt cystic. Systemically she was otherwise well. The overlying skin was blueish with prominent veins. The MRI also suggested a cyst but on excision it was revealed to be a high-grade sarcoma. After surgical excision she had a skin graft. Regular follow-ups with MRI have not shown any recurrence, she also has regular chest X-rays which have all been normal.
authors.affiliation: Walsall Manor, Walsall, UK.
authors.forename: Helen
authors.initials: H
authors.lastname: Cooper
mesh_terms: D001706:Biopsy; D002648:Child; D003560:Cysts / Q000175:diagnosis*; D003951:Diagnostic Errors; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D012509:Sarcoma / Q000175:diagnosis*; D012983:Soft Tissue Neoplasms / Q000175:diagnosis*; D013848:Thigh / Q000473:pathology