International Journal of Academic and Applied Research (IJAAR)   Year: 2022 | Volume: 6 | Issue: 6 | Page No.: 102-103 Rare and Secondary Synovial Localization of a Squamous Cell Carcinoma Revealing a Primary Mediastinum-Pulmonary Tumor Download PDF M.Ait-Rahou, O.Barchah, M.Lahdaili, H.Elhaoury, M.Madhar, R.Chafik, Y,Najeb Abstract: A 58-year-old chronic smoker referred for suspicion of tuberculosis arthritis of the left knee in front of feverish swelling, and total impotence evolving for 6 months with an altered general condition. He underwent drainage with biopsy of the synovial membrane and the results confirm a squamous cell carcinoma. The extension assessment revealed a primary lung tumor. Articular metastases are exceptional; they can reach the synovial membrane, the cartilage or the intra-articular spaces. The most affected joints are the knee first, the sternoclavicular, the shoulder, the hip, the interphalangeal, the wrist and finally the ankle.