Condylar Osteochondroma with Secondary Synovial Chondromatosis on TMJ Mass Evaluation

A 75-year-old female with no significant medical history was referred for evaluation of a left TMJ mass identified on panoramic imaging. The radiologist identified a condylar osteochondroma exhibiting corticomedullary-continuous exophytic growth, along with advanced degenerative joint disease and multiple calcified loose bodies within the joint space, findings suggestive of secondary synovial chondromatosis. The coexistence of these entities within a single TMJ is uncommon and presents a diagnostically challenging imaging picture. The radiologist noted that the combination of a benign osseous neoplasm with superimposed intra-articular pathology highlights the value of thorough full-volume review when evaluating TMJ abnormalities.