Legend MRI Brain; Ax FLAIR (left), Ax T2W (center), and Cor T1W (right): An elliptical lesion within the right choroidal fissure. It is isointense to CSF on all images. Bilateral mucosal thickening of the maxillary sinuses. Coronal images demonstrate a cavum septum vergae. Key words: mri tumor neoplasia

Brain Diagnosis: Arachnoid cyst in the choroidal fissure