the signal intensity in the region corresponding to the cerebral aqueduct was evaluated in three patients with noncommunicating tension hydrocephalus ( caused by aqueductal obstruction in two and type i arnold-chiari malformation in the other ) , seven patients with suspected normal-pressure hydrocephalus ( three of whom subsequently underwent successful shunting ) , and 10 patients with ex vacuo ( atrophic ) hydrocephalus .
C0020258
normal-pressure hydrocephalus
C0020255
hydrocephalus