Synovial osteolipoma.

Intraarticular synovial osteolipoma is an extremely rare tumor. Only two cases have been reported earlier to the best of our knowledge. It is a rare histological variant of lipoma, which contains mature lamellar bone. The largest tumor reported so far in the joint is 3 cm × 4 cm. Knee is a most common site. We report a large osteolipoma measuring 12 cm × 10 cm in the knee.

Intra articular synovial sarcoma.

Synovial sarcoma is a soft tissue neoplasm with a characteristic biphasic pattern. Incidence in soft tissues is 5-10%. Intra articularly synovial sarcoma is extremely rare. Fewer than 5% of all synovial sarcomas arise within the joint space. We report a case of intra articular synovial sarcoma in a young male who presented as internal derangement of the knee.