Leontiasis ossea
（重定向自Leontiasis）
![A 25-year-old man with leontiasis ossea as a complication of polyostotic fibrous dysplasia[1]](/Images/godic/202501/23/Leontiasis_ossea1809.jpg")
Leontiasis Ossea, also known as leontiasis, lion face or Lion Face Syndrome, is a rare medical condition, characterized by an overgrowth of the facial and cranial bones. It is not a disease in itself, but a symptom of other diseases, including Paget's disease, fibrous dysplasia, hyperparathyroidism and renal osteodystrophy.