Orbital fibrous dysplasia and headaches. There is expansion of the posterior left orbital roof up to 9 mm in thickness with low signal intensity and apparent narrowing of the orbital apex. There is no evidence of intracranial hemorrhage, mass, or acute infarct. The brain parenchyma appears unremarkable. There is no abnormal intracranial enhancement. The ventricles and basal cisterns are normal in size and configuration. There is no midline shift or herniation. The major cerebral flow voids are intact. The paranasal sinuses and scalp soft tissues are unremarkable. There is fluid signal within the bilateral mastoid air cells.
1. Finding compatible with fibrous dysplasia involving the left orbital roof with low signal and apparent narrowing of the orbital apex. Dedicated orbital imaging may be useful for evaluating the condition of the optic nerve.2. Fluid signal within the bilateral mastoid air cells may represent mastoiditis.