Pre and post contrast scans were performed demonstrating a mass in the right aspect of the pre- pontine cistern that has heterogeneous internal signal with irregular areas of intermediate T2 and FLAIR signal and exhibiting restricted diffusion. The lesion exerts moderate mass effect on the anterior surface of the pons, right cerebral peduncle and right trigeminal nerve. The medial aspect of the lesion is adjacent to the basilar artery and the superior surface abuts the right posterior cerebral artery. The posterior aspect of the lesion comes in proximity to the origin of the seventh and eighth nerves nerves without definite mass effect. There is no definite abnormal enhancement.