What are the permanent effects of hydrocephalus?

Many factors modify : outcome: cause, extent, sites of other areas of brain damage, age at diagnosis & at surgery, shunt revisions, etc.Early Intervention can alter the developmental trajectory, in part because of "recruitment", I.e., intact areas of young infant's brains assume functions of damaged areas. E.I. promotes maximum quality of movement in muscles with abnormal tone & strength. See www.hydroassoc.org.