Fibrous dysplasia of the bone can be diagnosed with routine imaging tests like X-ray or MRI. Most cases are diagnosed in adolescence and young adulthood and remain unchanged throughout life.

The frontal bone was the most commonly involved (27 cases, 64.3%), zfollowed by the sphenoid (24 cases, 57.1%). The most common pattern of bone involvement was monostotic (32 cases, 76.2%).

Fibrous dysplasia is a rare congenital disease of the bone that often affects the cranial facial structures, Dr. Netanel Ben-Shalom, a nuerosurgeon, at Northwell Lenox Hill Hospital, tells TODAY.com.