In what case would synovial biopsy be required?

?tumor?: Synovial tissues may contain tumors, primary or metastatic, or they may be inflamed by various processes including infections or autoimmune diseases. Synovial biopsies are done to identify any tumor as to its type, rule out tumor, and identify the nature of any inflammatory process which may be present. They are done when there are clinical or imaging findings to suggest one of these diagnoses.