Evaluate for structural abnormality, hydrocephalus: AM vomiting, abnormal movements, autism, and behavioral issues. There is a prominent cerebrospinal fluid intensity space overlying the anterior left frontal lobe that measures up to 8 mm in width, which is compatible with an arachnoid cyst. Otherwise, there is no evidence of intracranial hemorrhage, soft tissue mass, or acute infarct. The brain parenchyma and pituitary gland appear 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, and scalp soft tissues are grossly unremarkable. There is scattered paranasal sinus mucosal thickening.
Small left frontal convexity arachnoid cyst, but no evidence of ventriculomegaly, acute intracranial hemorrhage, solid mass, or acute infarct.