understanding of the anatomy of the thalamoperforating arteries facilitates localization of the site of obstruction in hydrocephalus , helps differentiate obstructive hydrocephalus from ventricular dilatation secondary to atrophy , permits differentiation between tumoral and non-tumoral dilatation of the third ventricle , aids in the diagnosis and differential diagnosis of intra third and para third ventricular masses including their posterior extent , and facilitates the diagnosis of thalamic , hypothalamic , and midbrain tumors .
C0020255
hydrocephalus
C0549423
obstructive hydrocephalus