patient 1 had a dandy-walker malformation with communicating hydrocephalus , aplasia of the posterior portion of the cerebellar vermis , and high insertion of the confluent sinus , while in patient 2 , a dandy-walker variant was found with aplasia of the cerebellar vermis and hypoplasia of the hemispheres , large cisterna magna , high insertion of the confluent sinus , but no hydrocephalus .
C0009451
communicating hydrocephalus
C0020255
hydrocephalus