Abstract
A 45-year-old lady presented to us with a large subcutaneous swelling on her left side of back of 1 year duration. Local examination revealed a 13×12 cm spherical swelling on the left lower paraspinal region. Magnetic resonance imaging of lumbosacral spine revealed a 13×12 cm mass having solid and cystic components with internal septations in the subcutaneous tissue of left posterior paraspinal area. The mass was hetrogenously hyperintense on T 2 weighted images suggestive of synovial sarcoma. Wide local excision of the lump was carried out followed by closure of the defect with a lateral intercostal artery based rotational flap. The histopathology of the excised tumor revealed synovial sarcoma that stained positive for cytokeratin and epithelial membrane antigen. This case highlights an unusually large subcutaneous synovial sarcoma present in para-spinal area.