Hyperdense mass (blue dotted line) with calcification anteriorly (green arrow) appears to be located in the verims, posterior to the 4th ventricle (yellow arrow). Inferiorly the mass ( * ) fills the 4th ventricle and extends through the foramen of Luschka (red arrow).
Multiple high T2 signal nodules are seen both supratentorially and along the cord (blue arrows) in keeping with CSF seeding.