Fibrous dysplasia is a developmental anomaly manifested as a defect in osteoblastic differentiation and maturation. It can affect any bone of the body. The skull and facial bones are the affected sites in 10–25% of patients with monostotic fibrous dysplasia and in 50% of patients with polyostotic fibrous dysplasia.
CT radiological features have three patterns:
- Ground glass pattern (>50%): as in this case.
- Homogeneously dense pattern (~25%).
- Cystic pattern (~20%).