Figure 17. Anterior disk displacement with osteoarthritis. (a, b) Sagittal and (c, d) coronal STIR images (4,240/30, 150-msec inversion time) of a TMJ with the jaw in the closed position, in two different positions in the respective plane. Joint space narrowing, contour irregularity, and subchondral cyst are best depicted in the coronal images; bone marrow edema and synovial fluid are best seen in the sagittal images. 1, Condyle with areas of bone edema; 2, articular fossa; 3, displaced disk; 4, effusion; 5, cyst.