“…TMJ synovial cysts need to be differentiated from synovial chondromatosis, osteoma, chondroma, synovial sarcoma, parotid tumors/cysts, lymphoma, and ganglion cysts. 11,21 Imaging, such as CT and MRI, helps diagnose synovial cysts, and MRI is essential for examining TMJ diseases. Okochi et al reported that six patients of synovial cysts and ganglion cysts showed low signal intensity on PDWI and very high signal intensity on T2WI on MRI images.…”