abnormal brain ventricle morphology dilated brain ventricles 2014-03-19T14:17:54Z MP:0012676 MPheno.ontology cerebral ventricular dilation csmith dilated cerebral vesicles the luminal space of one or more of the four communicating cavities within the brain that are continuous with the central canal of the spinal cord is increased in volume or area, usually with an increase in contained fluid