Figure 10. Presumed sarcoidal arthropathy in a 34-year-old woman with extensive bone involvement of the hands and feet. Axial intermediate-density-weighted MR image (4,016/15) of the left ankle demonstrates tenosynovitis of the peroneal tendon sheath (left arrow) and tendonosis of the Achilles tendon (right arrow). A subtle focus of abnormal marrow signal intensity is noted in the distal fibula.