Arachnoid cyst fenestration. There are recent postoperative findings related to left frontal convexity arachnoid cyst fenestration, with an air-fluid level and a punctate focus of blood products posteriorly within the cyst cavity. There is decreased mass effect upon the underlying brain parenchyma, where there is mild edema. However, there is no evidence of acute territorial cerebral infarct. 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. There is mild swelling of the left frontal scalp related to the craniotomy procedure.
Recent postoperative findings related to left frontal convexity arachnoid cyst fenestration, with an air-fluid level in the cyst cavity and decreased mass effect upon the underlying brain parenchyma. 