咬合異常を生じた顎関節滑膜軟骨腫症

• Published in: Shika Hoshasen Vol. 57; no. 2; pp. 81 - 85
• Main Authors: 藤下, 昌己, 永山, 元彦, 福井, 達真, 飯田, 幸弘, 住友, 伸一郎, 野尻, みのり, 松岡, 正登, 中尾, 寿奈, 吉田, 洋康, 勝又, 明敏
• Format: Journal Article
• Language: Japanese
• Published: 特定非営利活動法人 日本歯科放射線学会 2018; Japanese Society for Oral and Maxillofacial Radiology
• Subjects: Computed tomography; CT; Diagnostic imaging; Magnetic resonance imaging; MRI; Synovial osteochondromatosis; Temporomandibular joint; 滑膜性骨軟骨腫症; 画像診断; 顎関節
• ISSN: 0389-9705; 2185-6311
• DOI: 10.11242/dentalradiology.57.81

A 44-year-old female patient complained of spontaneous articular pain in her left temporomandibular joint. Her mandible had shifted toward the right, and she exhibited a crossbite. A large radiopaque body was seen in the posterior of the condylar head on radiography. Computed tomography revealed that the posterior of the left condyle was occupied by a radiopaque lesion measuring 15×20 mm. The left external auditory canal had been narrowed by the lesion. Several small radiopaque bodies were observed around the left condyle. Both the large mass and small radiopaque bodies were found to be located in a region of joint effusion in the upper joint space on magnetic resonance imaging （MRI）. The mandibular fossa exhibited a rough surface on both CT and MRI. Surgical enucleation of the lesion was performed. The histopathological diagnosis was synovial osteochondromatosis.