Monophasic synovial sarcoma arising from the rectum presenting as intractable anal pain.

Synovial sarcoma is a rare malignant mesenchymal tumour typically found in the extremities, but it can also develop in the gastrointestinal tract, with the upper rectum being the most common site. We describe a case of a man in his 60s diagnosed with monophasic synovial sarcoma in the lower rectum, presenting with severe, intractable anal pain.