Poorly Differentiated Synovial Sarcoma over Tendo Achilles: A Rare Case.

Synovial sarcomas of Tendo Achilles are rare tumors. The name “synovial sarcoma” is a misnomer, as it does not arise from synovial membrane. These tumors occur usually in the upper and lower limbs, more often in lower limbs in the distal parts. Distal extremities are more commonly associated with this tumor. It is seen to affect mostly tendon sheath, bursa, and joint capsule; knee being the commonly affected large joint. The common age group is 15-40 years. In our case, the initial pathology report came as hemanioma to us, but the immunohistochemistry report revealed it to be poorly differentiated synovial sarcoma.