Arachnoid cyst, surveillance. Compared to 9/24/2014, there is no significant change in arachnoid cyst involving the right middle cranial fossa measuring approximately 40 x 30 x 51 mm in the AP, transverse, and craniocaudal dimensions. There is unchanged mild mass effect on the right anterior temporal lobe and mild expansion of the right middle cranial fossa from chronic remodeling of the skull. There are dilated perivascular spaces in the left parietal lobe. No restricted diffusion to suggest acute ischemia. No intracranial hemorrhage. No other intracranial mass or mass-effect. The ventricles are within normal limits in size and configuration. Brain parenchyma is otherwise unremarkable for age. Major flow-voids are preserved. Anomalies involving the inner ears are better assessed on prior study. Bone marrow signal and extracranial soft tissues are within normal limits.
Unchanged arachnoid cyst involving the right middle cranial fossa with mild local mass effect.