In the suprasellar cistern is a small (~10 mm) mass that is T1 and T2 hyperintense with loss of signal on fat suppression sequences. There is no enhancement but there is chemical shift artifact. This mass sits posteroinferior to the optic chiasm, with distortion of the post-chiasmatic left optic nerve.
Peg-like cerebellar tonsils crowd the foramen magnum with 8 mm of descent below the foramen magnum. Imaged upper cervical cord is normal with no syrinx. No hydrocephalus.
8mm pineal cyst.