Abstract
A case of synovial chondromatosis of the temporomandibular joint with cranial extension is reported. A 48-year-old woman complained of dull pain at the left temporomandibular joint and limited jaw opening. The following examinations were performed: 1) sagittal tomography showed erosive resorption of the mandibular fossa; 2) magnetic resonance imaging and computed tomography revealed a tumor mass at the left temporomandibular joint extending to the middle cranial base; 3) 99mTc bone scintigraphy showed localized higher uptake. These findings suggested synovial chondromatosis, but also led to the suspicion of a malignant tumor. Open biopsy via the trans-zygomatic approach was performed. A clinical diagnosis of synovial chondromatosis was made. Total synovectomy, diskectomy and arthroplasty were performed simultaneously. The histopathological diagnosis was synovial chondromatosis. The patients' progress has been uneventful for 21 months postoperatively.
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