has part has part has_part characteristic of located in located in has modifier abnormal brain development hydrocephaly hydrocephalus MP:0001891 excessive accumulation of cerebrospinal fluid in the brain, especially the cerebral ventricles, often leading to increased brain size and other brain trauma MPheno.ontology MP:0000916 hydroencephaly abnormal brain ventricular system morphology abnormal increased accumulation cerebrospinal fluid brain ventricle