Fig. (3) Synovial chondrosarcoma in the setting of synovial chondromatosis 43 year-old female presenting with a massive localized chondroid lesion suspected to have malignant degeneration of synovial chondromatosis based on imaging (MRI, A) and symptomatology. Histologic evidence of chondrosarcoma, however, was only detected after resection of essentially the entire lesion.