Synovial chondromatosis (SC) is a benign nodular cartilaginous proliferation that mainly occurs in large joints. The temporomandibular joint (TMJ) is rarely affected. We present a case of a woman with concerns of swelling and posttraumatic pain in her right pre-auricular region. She presented an ultrasound exam performed in another institution that showed a suspected mandibular avulsion fracture. After clinical examination and computed tomography analyses, she diagnosed with SC of the TMJ misdiagnosed as an avulsion fracture of the condylar process of the mandible.
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