This article describes the case of a Caucasian girl with trisomy 9p diagnosed with congenital hydrocephalus. Congenital hydrocephalus caused by excessive liquor production as a result of choroid plexus hyperplasia is a rare condition that may necessitate unconventional treatment approaches. It is seen in trisomy 9p, where coexisting congenital heart disease complicates the therapeutic approach.
Source: https://journal.medizzy.com/congenital-hydrocephalus-in-a-trisomy-gained-child/