There is a 1.5 X 0.4 cm ovoid mass in the anterior interhemispheric fissure along the falx corresponding to the hyperdensity on the recent CT. The mass is low in signal intensity on T2 and FLAIR imaging and isointense to gray matter on T1-weighted imaging. The mass does not demonstrate blooming susceptibility artifact on GRE or restricted diffusion. After the administration of intravenous gadolinium there is peripheral enhancement of the anterior falx most pronounced around the ovoid mass with adjacent leptomeningeal enhancement over the frontal lobes, more pronounced on the left. There is abnormal hyperintense signal intensity on FLAIR in the adjacent parasagittal frontal lobes, more pronounced on the right.
There are minimal scattered foci of white matter signal hyperintensity on T2 and FLAIR imaging.
There has been a prior partial left mastoidectomy. There is opacification of the right mastoid air cells. The maxillary sinuses are hypoplastic and opacified. There is near total opacification of the posterior ethmoid air cells.