Yes, it appears that congenital hydrocephalus can run in families. It is thought that congenital hydrocephalus can be caused by genetic defects that can be passed from one or both parents to a child, but the direct links to hereditary disorders are still being investigated. However, experts have found a connection between a rare genetic disorder called L1 syndrome and hydrocephalus. L1 syndrome is the result of mutated gene. It can cause a condition known as aqueductal stenosis, which involves an obstruction of the flow of cerebrospinal fluid (CSF), which is a fluid that is necessary for the normal functioning of the brain and spinal cord. This obstruction of the CSF can cause hydrocephalus. Researchers estimate that L1 syndrome occurs in 1 in 25,000 to 60,000 males and rarely occurs in females.