Case 1: 47-year-old woman with left TMJ swelling and pain.

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Presentation transcript:

Case 1: 47-year-old woman with left TMJ swelling and pain. Case 1: 47-year-old woman with left TMJ swelling and pain. A, Panoramic radiograph shows an ovoid calcified body (arrow) anterior to the left mandibular neck.B, Axial CT scan with soft tissue display shows semilunar soft tissue masses (arrowheads), suggesting bilateral anterior disk displacement.C, Axial CT scan with bone display at same level as B shows irregularly bordered calcified body in zonal area (arrowheads), thought to be partial calcification of the disk.D and E, Axial (D) and coronal (E) CT scans show ovoid calcified body (arrow), about 2 mm in diameter, which was visible on the panoramic radiograph (A).F, Histologic section of loose body shows cartilaginous tissue (A), transitional zone (B), bone tissue (C), and thin connective tissue (D) (hematoxylin-eosin, original magnification ×300).G, Histologic section of the synovial membrane shows a partial transformation from the fibrous connective tissue to the cartilaginous tissue, or chondrometaplasia (hematoxylin-eosin, original magnification × 300). Jun-ichi Koyama et al. AJNR Am J Neuroradiol 2001;22:1203-1206 ©2001 by American Society of Neuroradiology