Legend Axial flair and T2 images as well as a sag T1 image show a well defined, spherical mass in the anterior roof of the third ventricle corresponding to the entrance of the foramina of Monroe. It is hyperintense on T1 and flair images. The ventricles are normal size and there is no evidence of transependymal flow of csf.

Legend Pre and post gad images show no significant enhancement. The lesion is hyperdense on CT. Key words: mri tumor neoplasia

Brain Diagnosis: Colloid cyst