Hydrocephalus

===External hydrocephalus===
External hydrocephalus is a condition generally seen in infants which involves enlarged fluid spaces or subarachnoid spaces around the outside of the brain. This condition is generally [[benign]], and resolves spontaneously by two years of age<ref>{{cite book |url=https://books.google.com/books?id=0TC9Cns4Qz8C&q=Greenberg+handbook+of+neurosurgery+external+hydrocephalus&pg=PA307 |title=Handbook of Neurosurgery |isbn=9781604063264 | vauthors = Greenberg MS |date=2010-02-15 |publisher=Thieme |url-status=live |archive-url=https://web.archive.org/web/20230708022539/https://books.google.com/books?id=0TC9Cns4Qz8C&pg=PA307 |archive-date=2023-07-08}}</ref> and therefore usually does not require insertion of a shunt. Imaging studies and a good medical history can help to differentiate external hydrocephalus from [[subdural hematoma|subdural hemorrhages]] or symptomatic chronic extra-axial fluid collections which are accompanied by vomiting, headaches, and seizures.<ref>{{Cite web |title=Subdural Hematomas in the Elderly: The Great Neurological Imitator {{!}} 2000-03-01 {{!}} AHC Media: Continuing Medical Education Publishing {{!}} Relias Media - Continuing Medical Education Publishing |url=https://www.reliasmedia.com/articles/44955-subdural-hematomas-in-the-elderly-the-great-neurological-imitator |access-date=2022-05-17 |website=www.reliasmedia.com}}</ref><ref>{{Cite journal |title= External hydrocephalus: A probable cause for subdural hematoma in infancy|url=https://www.researchgate.net/publication/10800536 |journal= Pediatric Neurology|year=2003 |language=en |doi=10.1016/S0887-8994(02)00500-3|pmid=12699866 |last1=Ravid |first1=S. |last2=Maytal |first2=J. |volume=28 |issue=2 |pages=139–141 }}</ref>