Sentences with phrase «fourth ventricle»

Virus, either free or lymphocyte associated, may enter the CNS by entering into mononuclear cells in the meninges, choroid plexus, epithelial cells of the fourth ventricle and ependymal cells lining the ventricular system.

A selective hypoplasia of the cerebellar vermis is also seen in dogs, and when combined with hydrocephalus and cyst - like dilatation of the fourth ventricle, the condition has been termed the Dandy - Walker syndrome, which may have a familial basis.

The tumors tend to bulge into the fourth ventricle, often replacing part of the cerebellar vermis and compressing the midbrain rostrally and the brain stem ventrally.

Ependymomas of the fourth ventricle may encircle the brain stem.