Headache and imbalance. There is mild prominence of the extra-axial cerebellospinal fluid spaces along the medial let temporal convexity, measuring up to 10 mm in thickness, which may represent arachnoid cyst formation. Otherwise, there is no evidence of intracranial hemorrhage, mass, or acute infarct, and the brain parenchyma appears unremarkable. 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 orbits, skull, paranasal sinuses, and scalp soft tissues are grossly unremarkable.
Probable left middle cranial fossa arachnoid cyst. Otherwise, no evidence of acute intracranial hemorrhage, mass, or acute infarct.