Synovial Sarcoma Masquerading as Pseudoaneurysm with Hematoma

Abstract

Synovial sarcoma is an uncommon soft tissue sarcoma, characterized by insidiously slowgrowing mass, local recurrence and late metastasis. A 36-year-old man with antecedent minor trauma history presented with left arm swelling for one year. The initial clinical and radiological impression was pseudoaneurysm with hematoma. Synovial sarcoma was diagnosed with histopathology and chromosomal t(X;18) translocation confirmation. Soft tissue sarcoma with extensive hemorrhage and necrosis may masquerade as a benign lesion. In the literature, only one case report with false aneurysm caused by synovial sarcoma located at radial artery has been published. The clinicians and radiologists should be aware of this entity and include synovial sarcoma in the differential diagnosis of pseudoaneurysm-like or cystic soft tissue lesions of the extremities.