Synovitis is the medical term for inflammation of the synovial membrane. This membrane lines Synovitis may occur in association with arthritis as well as lupus, gout, and other conditions. Synov.May 5, 2016 Often seen in arthritic conditions, and most pronounced in rheumatoid arthritis, synovitis can cause pain and inflammation within the affected .Apr 19, 2011 Key findings from the available studies comparing synovial tissue of PsA and rheumatoid arthritis patients are discussed in this review. Also .In a way, it's a fancy term for "arthritis," which means joint inflammation. But there is a difference between synovitis and arthritis. Synovitis describes prominent .