Facial disfigurement due to osteitis fibrosa cystica or brown tumor from secondary hyperparathyroidism in patients on dialysis: A systematic review and an illustrative case report.

Osteitis fibrosa cystica (OFC) is the most frequent type of osseous change in renal osteodystrophy affecting the majority of dialysis patients. Brown tumors are a severe form of OFC. The involvement of the craniofacial skeleton causing facial disfigurement in patients on dialysis appears to be limited to case reports.