Fig. 1. Preoperative clinical photograph of patient with localized swelling on left temporomandibular joint (arrow). The overlaying skin is normal in color.
Fig. 3. Computed tomography (CT). (A) Axial CT image, (B) coronal CT image shows a non-specific soft tissue mass (white arrows) on the left temporomandibular joint and high density part. There is no adjacent bone involvement.
Fig. 2. Panoramic radiograph reveals that there are no pathological findings.
Fig. 4. Gross specimen. (A) Resection gross specimen shows a lobulated and circumscribed mass. (B) The sectioned specimen has a homogeneous yellowish white appearance.
Fig. 5. Histologic examination. (A) The lesion demonstrates characteristic scattered foci of calcification (black arrows) (H&E stain, ×40). (B) Calcification area (black star) and collagenous stroma (black arrows) are observed (H&E stain, ×200). (C) Multinucleated giant cell (black star) is seen around the calcification area. Spindled fibroblasts are aligned linearly (black arrows) (H&E stain, ×200). (D) A local chondroid differentiation (black stars) reveals surrounded by peripheral less cellular and fibroblasic component (black arrow) (H&E stain, ×200).