Synovial osteochondromatosis of the temporomandibular joint: A case report

Figure 1 Coronal cut of computed tomography image (bone window) highlighting the erosion of the right glenoid fossa (arrow). A soft tissue mass can faintly be observed on either side of the mandibular condyle, which is better delineated in a soft tissue window (not pictured).

Figure 2 Axial cut of magnetic resonance imaging T1 weighted post-contrast image depicting the bilobed mass within the temporomandibular joint space on either side of the mandibular condyle (arrows) with associated joint capsule distention. On magnetic resonance imaging STIR sequence images (not pictured), significant joint effusion is noted.

Figure 3 Multiple, irregular firm cartilaginous fragments removed from the temporomandibular joint space.

Figure 4 Multiple separate nodules of cartilaginous tissue (loose bodies) (HE, × 20).

Figure 5 Lobules of hyaline cartilage. No atypia, hypercellularity or mitosis are noted (HE, × 200).