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Tumours and pseudotumorous lesions originating from the synovial membrane of the temporomandibular joint are rare. We report a series of six cases of such disorders. There were two cases of synovial chondromatosis, two of calcium pyrophosphate dihydrate crystal deposition disease, one nodular synovitis and one synovial sarcoma. Three patients were female and three were male. Their ages ranged from 36 to 70 years. All had atypical clinical and radiographical presentation. The prevalence, clinical and radiographical findings and pathological features of each disease entity are discussed and a review of the literature is made concerning all tumours and pseudotumours arising from the temporomandibular joint.

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