Legend MRI Brain; Ax T2W (left), and Ax PD (right): Hyperintense lesion in the region of the pineal gland and quadrigeminal cistern.

Legend MRI Brain; Cor T1W without (left top) and with Gd (left bottom), Ax T1W Post-Gd (right top), and Sag T1W Post-Gd (right bottom): The lesion is T1W hypointense and does not enhance. It compresses the adjacent tectum and vermis. Key words: mri tumor neoplasia pineal region

Brain Diagnosis: Arachnoid cyst of the quadrigeminal cistern