5 month old Siamese

Findings

Images shown are axial – T1, T2, FLAIR, T1 post contrast. Sagittal – T1, T2, T1 post contrast.
There is moderate dilation of the ventricular system. There is a pocket of fluid accumulation at the cerebellomedullary cistern. This fluid is slightly hypointense to CSF on the T2 weighted images. This fluid pocket is compressing the spinal cord ventrally.
There is marked meningeal enhancement ventrally along the brain stem. There is also rim enhancement of the fluid pocket at the cerebellomedullary cistern.