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59-year-old woman with PVNS of the right TMJ.
FINDINGS: (a) Postoperative pathology revealed the tumor to be diffuse PVNS with temporal bone tissue involvement. (b) Pathological features of PVNS include synovial hyperplasia with bands of cellular tissue containing multinucleated giant cells (red arrows).
TECHNIQUE: (a) hematoxylin-eosin stain, ×10 objective (b) hematoxylin-eosin stain, ×40 objective.
