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This myriad of terms demonstrates the confusion about the entity, that may even group together different etiological processes.\u00a0In this review, we aim to shed light on this matter in an effort to restate the defining features of the clinical picture and sum the evidence and current understanding of its pathophysiology and related imaging findings.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Extensive and updated review of the literature with special focus on defining features, clinical history with long term evaluation and pathophysiological process.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Functional and molecular CSF studies as well as clinical evidence challenges the common pathophysiological theory based on non-functional arachnoid villi. Conversely, there is increasing evidence supporting cerebro-venous system abnormalities as the main pathophysiological factor. Additionally, long term cohorts studies show that it may have subtle but irreversible neurodevelopmental consequences.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Subarachnomegaly is an age-related condition of the infancy with radiological enlargement of CSAS and often self limiting course. However, considering the evidence on pathophysiology as outlined herein and long term outcome reports, further research effort is needed to assess the consequences of venous outflow impairment and enlarged CSAS and how this relates to imaging findings and neurodevelopment test results later in life<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00381-021-05328-z","type":"journal-article","created":{"date-parts":[[2021,10,23]],"date-time":"2021-10-23T08:02:31Z","timestamp":1634976151000},"page":"3455-3463","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Subarachnomegaly\u2014venous congestion of infancy"],"prefix":"10.1007","volume":"37","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1554-509X","authenticated-orcid":false,"given":"Laura V.","family":"Sainz","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Martin U.","family":"Schuhmann","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,10,23]]},"reference":[{"issue":"4","key":"5328_CR1","first-page":"7","volume":"12","author":"N Khosroshahi","year":"2018","unstructured":"Khosroshahi N, Nikkhah A (2018) Benign enlargement of subarachnoid space in infancy: a review with emphasis on diagnostic work-up.\u00a0Iran\u00a0J\u00a0Child Neurol\u00a012(4):7","journal-title":"Iranian journal of child neurology"},{"issue":"10","key":"5328_CR2","first-page":"237","volume":"22","author":"R Kumar","year":"2006","unstructured":"Kumar R (2006) External hydrocephalus in small children. 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