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MRI studies have shown that almost half of all new\u2010borns have perinatal subdural blood, generally referred to as subdural haematoma (SDH) or perinatal SDH. Epidemiologically there are striking similarities between chronic SDH and BEH in infants.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Discussion of pathophysiological mechanisms for BEH and chronic SDH, based on existing literature.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Perinatal SDH is common, and we hypothesise that this condition in some infants develop into extra\u2010axial fluid collections, known as hygroma, BEH or chronic subdural haematoma. The mechanism seems to be an intradural bleeding that creates an obstructive layer preventing normal CSF absorption. The site where the bleeding originates from and those areas enveloped in blood from the primary damaged area are prone to later rebleeds, seen as \u2018acute on chronic\u2019 haematomas. With steady production of CSF and the blockage, increased intracranial pressure drives the accelerated skull growth seen in many of these children.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Perinatal SDH hampers CSF absorption, possibly leading to BEH and chronic SDH, with a high risk of false accusations of abuse. Close monitoring of head circumference could prove vital in detecting children with this condition.<\/jats:p><\/jats:sec>","DOI":"10.1111\/apa.15072","type":"journal-article","created":{"date-parts":[[2019,10,22]],"date-time":"2019-10-22T07:17:51Z","timestamp":1571728671000},"page":"659-666","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Examining perinatal subdural haematoma as an aetiology of extra\u2010axial hygroma and chronic subdural haematoma"],"prefix":"10.1111","volume":"109","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3303-6977","authenticated-orcid":false,"given":"Sverre Morten","family":"Zahl","sequence":"first","affiliation":[{"name":"Department of Ear, Nose and Throat Aalesund Hospital Aalesund Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Knut","family":"Wester","sequence":"additional","affiliation":[{"name":"Department of Clinical Medicine K1 University of Bergen 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