Progressive extra-articular ankylosis secondary to chronic unilateral dislocation of the temporomandibular joint

Dislocation of the temporomandibular joint (TMJ) may be due to various reasons. Long-standing dislocation is a rare condition as it is a sequela of unrecognised dislocation, which can lead to ankylosis of TMJ, a rare clinical representation. A male patient in his late 30s reported with a deviated mandible to the left side, occlusal derangement and reduced mouth opening of 1 cm. The radiological investigation showed a bony mass above the normal condylar appearance within the glenoid fossa and extending medially to the base of the skull. Ankylosis release was done with right condylotomy, and removal of the bony mass and right coronoidectomy was done and reconstructed with prosthetic condyle.