Fibrous dysplasia of the orbital roof

Discussion:

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:

  1. Ground glass pattern (>50%): as in this case.
  2. Homogeneously dense pattern (~25%).
  3. Cystic pattern (~20%). 
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