T2W and FLAIR images show patchy areas of hyperintensity within the subcortical
and periventricular white matter. Also, note the abnormal high signal in the corpus
callosum and mildly enlarged ventricles.
Axial T2W images demonstrate hyperintensity in the left pons and cerebellum, particularly
around the 4th ventricle. Mass effect compresses the pontine and CP angle cisterns and
the 4th ventricle.
Sagittal T1W image clearly shows the mass effect in the posterior fossa. Focal
enhancement is present posterior to the 4th ventricle.
Key words: mri tumor neoplasia
Oligoastrocytoma with hydrocephalus and transependymal
CSF flow & deep white matter ischemia