Cerebral Ventricles: Common Abnormalities
    Changes in size, shape, and density are frequent abnormalities in the ventricles. They can involve only parts of the ventricular system and may be symmetric or asymmetric. Mass lesions often displace all or part of a ventricle.
  • Hydrocephalus = ventricular enlargement = ventriculomegaly can be due to CSF flow problems OR to cerebral atrophy OR a normal variant if mild or moderate
  • Intraventricular hemorrhage shown by intraventricular hyperdensity if acute
  • Intraventricular mass lesions such as meningioma, colloid cyst, etc. are unusual but important
  • Asymmetry in size suggesting mass effect OR atrophy focal or diffuse OR normal variant OR developmental anomalie
  • Odd shape due to congenital abnormality such as agenesis of corpus callosum or else acquired area of brain loss as occurs in Huntington disease

Transaxial CT unenhanced brain window showing shunt in right lateral ventricle, moderate symmetric enlargement of bodies of lateral ventricles, normal CSF density but with periventricular hypodensity and some staples in the scalp from recent shunt insertion

Here is a link to review ventricular anatomy (on MRI images)
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