Figure 19a. Synovial sarcoma in a 60-year-old woman. (a) Coronal T2-weighted (6,000/112) MR image shows a large paravertebral mass with heterogeneous signal intensity and numerous internal septa. The tumor has displaced the diaphragm (arrowheads). (b) Photograph of the dissected tumor reveals invasion of the paravertebral muscle (arrowheads) and cystic degeneration and hemorrhage (arrow), which account for the heterogeneous signal intensity observed in the tumor on the MR image.