<prompt> All of the following statements about synovial cell sarcoma, are true, except -Originate from synovial liningOccur more often at extraarticular sitesUsually seen in patients less than 50 years of ageKnee and foot are common sites involved  <response>: The term synovial cell sarcoma is however a misnomer as synovial cell sarcomas do not arise from synovium.Most synovial sarcomas are extraarticular and only less than 10 are intraarticular. 