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Several pathogenic hypotheses have been proposed but the most accredited theory seems to be delayed maturation of the arachnoid villi. There is a consensus that this is a benign entity, correlated to a familial predisposition and, in some cases, inheritance. CT and MRI are very important to make a diagnosis but also to establish the prognosis in patients who encounter the rare complications such as subdural haematomas. In conclusion, CT and MRI can provide a highly accurate diagnosis in these patients, allowing a preliminary assessment of the prognosis, particularly regarding the enlarged subarachnoid space limits and the \u201ccortical vein\u201d sign which can predict a further complication. These results are obtained with the same examination performed in a standard CT or MRI study of the brain and no injection of contrast medium is needed. <\/jats:p>","DOI":"10.15274\/nrj-2014-10020","type":"journal-article","created":{"date-parts":[[2014,4,10]],"date-time":"2014-04-10T14:19:07Z","timestamp":1397139547000},"page":"245-250","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":42,"title":["Benign External Hydrocephalus in Infants"],"prefix":"10.1177","volume":"27","author":[{"given":"Maria Adele","family":"Marino","sequence":"first","affiliation":[{"name":"Neuroradiology Unit, Department of Biomedical Sciences and Morphologic and Functional Imaging"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rosa","family":"Morabito","sequence":"additional","affiliation":[{"name":"Neuroradiology Unit, Department of Biomedical Sciences and Morphologic and Functional Imaging"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sergio","family":"Vinci","sequence":"additional","affiliation":[{"name":"Neuroradiology Unit, Department of Biomedical Sciences and Morphologic and Functional Imaging"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Antonino","family":"German\u00f2","sequence":"additional","affiliation":[{"name":"Department of Neurosciences, Psychiatric and Anaesthesiological Sciences, Neurosurgery Unit"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marilena","family":"Briguglio","sequence":"additional","affiliation":[{"name":"National Research Council of Italy (CNR), Institute of Clinical Physiology (IFC), University of Messina; Messina, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Concetta","family":"Alafaci","sequence":"additional","affiliation":[{"name":"Department of Neurosciences, Psychiatric and Anaesthesiological Sciences, Neurosurgery Unit"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Enricomaria","family":"Mormina","sequence":"additional","affiliation":[{"name":"Neuroradiology Unit, Department of Biomedical Sciences and Morphologic and Functional Imaging"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marcello","family":"Longo","sequence":"additional","affiliation":[{"name":"Neuroradiology Unit, Department of Biomedical Sciences and Morphologic and Functional Imaging"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francesca","family":"Granata","sequence":"additional","affiliation":[{"name":"Neuroradiology Unit, Department of Biomedical Sciences and Morphologic and Functional Imaging"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2014,4,1]]},"reference":[{"key":"bibr1-NRJ-2014-10020","doi-asserted-by":"publisher","DOI":"10.1001\/archpedi.1914.02180010416002"},{"key":"bibr2-NRJ-2014-10020","doi-asserted-by":"publisher","DOI":"10.2214\/ajr.148.6.1223"},{"key":"bibr3-NRJ-2014-10020","doi-asserted-by":"publisher","DOI":"10.1001\/archneur.1978.00500320061014"},{"issue":"6","key":"bibr4-NRJ-2014-10020","first-page":"398","volume":"11","author":"Andersson H","year":"1984","journal-title":"Child Brain."},{"issue":"1","key":"bibr5-NRJ-2014-10020","doi-asserted-by":"crossref","first-page":"36","DOI":"10.1007\/BF00316560","volume":"8","author":"Ordita JC","year":"1992","journal-title":"Childs Nerv Syst."},{"key":"bibr6-NRJ-2014-10020","unstructured":"Greenberg MS. 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