cases, extremity Week 290: Case 6 April 26, 2023 pathadmin 1. Presented by Edward McCarthy, M.D. and prepared by Danielle Wehle, M.D.A 40 year-old man had a painful knee for three months. An arthroscopic exam demonstrated a deep, brown-pigmented frond of synovial membrane. A biopsy was performed.images/case6ahemo.jpgimages/case6bImage1.jpgimages/case6cImage3.jpgPigmented villonodular synovitisRheumatoid synovitisHemosiderotic synovitis Loading...