Hydrocephalus

Hydrocephalus, or ventricular enlargement, may involve some or all of the ventricles, depending on whether there is a specific site of obstruction to CSF flow. The ventricles appear enlarged (ex vacuo) also if there is significant loss of brain tissue.

Hydrocephalus Obstructive

Clinical:

F-54 with delayed milestones, S/P occipital decompression of Chiari malformation, with progressive gait ataxia, adduction paresis of eyes, nystagmus and dementia

CT scans without contrast show enlargement of lateral and third ventricles, but not the fourth ventricle, due to aqueductal stenosis. The posterior fossa is distorted due to a congenital Chiari malformation and previous surgery