{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,3]],"date-time":"2026-03-03T22:00:09Z","timestamp":1772575209624,"version":"3.50.1"},"reference-count":26,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["PED"],"published-print":{"date-parts":[[2016,7]]},"abstract":"<jats:sec>\n<jats:title>OBJECTIVE<\/jats:title>\n<jats:p>Ventricular dilation secondary to tumor obstruction of the posterior fossa CSF outflow in childhood is an intraaxial process. However, third ventriculostomy or complete tumor removal often fails to reduce the pressure in some children, and in others there is a delayed reduction in intracranial pressure; this is termed the adaptation period. The cause of this adaptation period has not been studied. Venous sinus compression is highly correlated with other forms of childhood hydrocephalus, and this study seeks to follow the changes that occur in sinus cross-sectional area after surgery.<\/jats:p><\/jats:sec>\n<jats:sec>\n<jats:title>METHODS<\/jats:title>\n<jats:p>Twelve children with posterior fossa tumors underwent MRI examination that included standard T2-weighted and 3D contrast-enhanced images obtained preoperatively, in the immediate postoperative period, and after several months. The volumes of the lateral and third ventricles and the minimum cross-sectional area of the transverse and sigmoid sinuses were measured. Patients were categorized by 1) shunt status (those who required a shunt vs those who did not) and 2) by age (those younger than 3 years vs those older than 3 years at diagnosis).<\/jats:p><\/jats:sec>\n<jats:sec>\n<jats:title>RESULTS<\/jats:title>\n<jats:p>There was a significant reduction in ventricular volume in both the immediate and secondary follow-up periods for all patients. There was preoperative venous sinus compression in all groups, which did not change significantly in the immediate postoperative period but did improve in the secondary follow-up period. The younger children had larger ventricles and smaller sinuses before surgery compared with the older children.<\/jats:p><\/jats:sec>\n<jats:sec>\n<jats:title>CONCLUSIONS<\/jats:title>\n<jats:p>In children with obstructed hydrocephalus caused by tumor, there is secondary compression of venous outflow, indicating both an intra- and extraaxial process. The expansion of the sinuses following decompression of the posterior fossa is delayed and may correlate with the adaptation period. Younger children have greater sinus compression than older ones.<\/jats:p><\/jats:sec>","DOI":"10.3171\/2016.1.peds15676","type":"journal-article","created":{"date-parts":[[2016,4,1]],"date-time":"2016-04-01T13:57:47Z","timestamp":1459519067000},"page":"21-28","source":"Crossref","is-referenced-by-count":26,"title":["Childhood hydrocephalus secondary to posterior fossa tumor is both an intra- and extraaxial process"],"prefix":"10.3171","volume":"18","author":[{"given":"Grant A.","family":"Bateman","sequence":"first","affiliation":[{"name":"Department of Medical Imaging, John Hunter Hospital; and"},{"name":"Newcastle University Faculty of Health, Callaghan Campus, Newcastle, New South Wales, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mark","family":"Fiorentino","sequence":"additional","affiliation":[{"name":"Department of Medical Imaging, John Hunter Hospital; and"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1754","reference":[{"key":"b1-peds15676","series-title":"J Neurosurg Pediatr","doi-asserted-by":"publisher","first-page":"125","DOI":"10.3171\/2013.10.PEDS13343","article-title":"Hemodynamically significant venous collapse underlying neonatal hydrocephalus","volume":"13","author":"Bateman","year":"2014"},{"key":"b2-peds15676","series-title":"Fluids Barriers CNS","doi-asserted-by":"publisher","first-page":"11","DOI":"10.1186\/2045-8118-11-11","article-title":"Cerebrospinal fluid absorption block at the vertex in chronic hydrocephalus: obstructed arachnoid granulations or elevated venous pressure?","volume":"11","author":"Bateman","year":"2014"},{"issue":"6 Suppl","key":"b3-peds15676","series-title":"J Neurosurg","first-page":"439","article-title":"Idiopathic hydrocephalus in children and idiopathic intracranial hypertension in adults: two manifestations of the same pathophysiological process?","volume":"107","author":"Bateman","year":"2007"},{"key":"b4-peds15676","series-title":"J Neurosurg","doi-asserted-by":"publisher","first-page":"446","DOI":"10.3171\/2008.6.17609","article-title":"A mathematical model of idiopathic intracranial hypertension incorporating increased arterial inflow and variable venous outflow collapsibility","volume":"110","author":"Bateman","year":"2009"},{"key":"b5-peds15676","series-title":"Childs Nerv Syst","doi-asserted-by":"publisher","first-page":"879","DOI":"10.1007\/s003810000373","article-title":"The fate of the cerebrospinal fluid after neuroendoscopic third ventriculostomy","volume":"16","author":"Cartmill","year":"2000"},{"key":"b6-peds15676","series-title":"Neurosurgery","doi-asserted-by":"publisher","first-page":"126","DOI":"10.1227\/01.NEU.0000195972.48670.86","article-title":"Intracranial pressure monitoring and lumbar puncture after endoscopic third ventriculostomy in children","volume":"58","author":"Cinalli","year":"2006"},{"key":"b7-peds15676","series-title":"Neurosurgery","doi-asserted-by":"publisher","first-page":"402","DOI":"10.1227\/00006123-199403000-00003","article-title":"An analysis of factors determining the need for ventriculoperitoneal shunts after posterior fossa tumor surgery in children","volume":"34","author":"Culley","year":"1994"},{"key":"b8-peds15676","series-title":"Childs Nerv Syst","doi-asserted-by":"publisher","first-page":"997","DOI":"10.1007\/s00381-012-1752-6","article-title":"Changes in intracranial CSF distribution after ETV","volume":"28","author":"Di Rocco","year":"2012"},{"key":"b9-peds15676","series-title":"Pediatr Neurosurg","doi-asserted-by":"publisher","first-page":"92","DOI":"10.1159\/000098379","article-title":"Management of hydrocephalus in children with posterior fossa tumors: role of tumor surgery","volume":"43","author":"Due-T\u00f8nnessen","year":"2007"},{"key":"b10-peds15676","series-title":"J Neurointerv Surg","doi-asserted-by":"publisher","first-page":"e22","DOI":"10.1136\/neurintsurg-2012-010371","article-title":"Concomitant intracranial pressure monitoring during venous sinus stenting for intracranial hypertension secondary to venous sinus stenosis","volume":"5","author":"Fargen","year":"2013"},{"issue":"1 Suppl","key":"b11-peds15676","series-title":"J Neurosurg","first-page":"40","article-title":"Hydrocephalus in children with posterior fossa tumors: role of endoscopic third ventriculostomy","volume":"103","author":"Fritsch","year":"2005"},{"key":"b12-peds15676","series-title":"J Neurosurg Sci","first-page":"29","article-title":"Stenosis of the aqueduct of Sylvius. 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