There is a solid hyperdense mass in the midline of the posterior fossa. It seems intimately related in the inferior vermis, abutting in the floor of the fourth ventricle and extending through the foramen magnum.
The mass has homogenous enhancement with no diffusion restriction. There are prominent flow voids within the tumour. I note that the tumour is hyperdense on a non-contrast CT.
Mild hydrocephalus.
The remainder of the brain is unremarkable.