A single case of Huntington's disease simultaneously occurring with obstructive hydrocephalus. A case of simultaneously occurring Huntington's disease and obstructive hydrocephalus is presented. Huntington's and other neurodegenerative diseases have been described with normal-pressure hydrocephalus; however, no such description with obstructive hydrocephalus has been reported. The obstructive hydrocephalus displays a familial tendency in its presentation. 