Female, 8 years old, with history of arachnoid cyst status post cyst fenestration in June 2015. Evaluate for changes. The fenestrated arachnoid cyst located at midline just above the cerebellar vermis shows no significant interval change when compared to the prior examination. There is no mass effect upon the tectum or the vermis, and the cerebral aqueduct remains well visualized and patent.No evidence of significant parenchymal signal abnormality is seen. There are no areas of edema or mass effect. No pathologic parenchymal or extra-axial enhancement is seen. Sequelae of prior suboccipital craniectomy are redemonstrated without significant interval change. The ventricles are normal in size and morphology.
Stable size of the fenestrated arachnoid cyst.