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However, little information about its incidence and risk factors after GKRS<\/jats:styled-content> for intracranial schwannomas is yet available. The objective of this study was to identify the incidence and risk factors for developing communicating HCP<\/jats:styled-content> after GKRS<\/jats:styled-content> for intracranial schwannomas. We retrospectively reviewed a total of 702 patients with intracranial schwannomas who were treated with GKRS<\/jats:styled-content> between January 2002 and December 2015. We investigated patients\u2019 age, gender, tumor origin, previous surgery history, tumor volume, marginal radiation dose, and presence of tumor control to identify associations with communicating HCP<\/jats:styled-content> following GKRS<\/jats:styled-content>. To make predictive models of communicating HCP<\/jats:styled-content>, we performed Cox regression analyses and constructed a decision tree for risk factors. In total, 29 of the 702 patients (4.1%) developed communicating HCP<\/jats:styled-content> following GKRS<\/jats:styled-content>, which required ventriculo\u2010peritoneal (VP<\/jats:styled-content>) shunt surgery. Multivariate analyses indicated that age (P<\/jats:italic>\u00a0=\u00a00.0011), tumor origin (P<\/jats:italic>\u00a0=\u00a00.0438), and tumor volume (P<\/jats:italic>\u00a0<\u00a00.0001) were significant predictors of communicating HCP<\/jats:styled-content> in patients with intracranial schwannoma after GKRS<\/jats:styled-content>. Using machine\u2010learning methods, we fit an optimal predictive model. We found that developing communicating HCP<\/jats:styled-content> following GKRS<\/jats:styled-content> was most likely if the tumor was vestibular origin and had a volume \u226513.65\u00a0cm3<\/jats:sup>. Communicating HCP<\/jats:styled-content> is not a rare complication of GKRS<\/jats:styled-content> for intracranial schwannomas. Under specific conditions, communicating HCP<\/jats:styled-content> following GKRS<\/jats:styled-content> is warranted for this patient group, and this patient group should be closely followed up.<\/jats:p>","DOI":"10.1002\/cam4.955","type":"journal-article","created":{"date-parts":[[2016,11,24]],"date-time":"2016-11-24T04:53:19Z","timestamp":1479963199000},"page":"3615-3621","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Analysis of risk factors to predict communicating hydrocephalus following gamma knife radiosurgery for intracranial schwannoma"],"prefix":"10.1002","volume":"5","author":[{"given":"Seunghoon","family":"Lee","sequence":"first","affiliation":[{"name":"Department of Neurosurgery Samsung Medical Center Sungkyunkwan University School of Medicine Seoul Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Seong\u2010Wook","family":"Seo","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery Orthopedics Samsung Medical Center Sungkyunkwan University School of Medicine Seoul Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Juyoung","family":"Hwang","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery Samsung Medical Center Sungkyunkwan University School of Medicine Seoul Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ho Jun","family":"Seol","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery Samsung Medical Center Sungkyunkwan University School of Medicine Seoul Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Do\u2010Hyun","family":"Nam","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery Samsung Medical Center Sungkyunkwan University School of Medicine Seoul Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jung\u2010Il","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery Samsung Medical Center Sungkyunkwan University School of Medicine Seoul Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Doo\u2010Sik","family":"Kong","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery Samsung Medical Center Sungkyunkwan University School of Medicine Seoul Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2016,11,23]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijrobp.2008.12.063"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.3171\/jns.1995.82.5.0711"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1177\/019459989310900608"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1056\/NEJM195406032502202"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1177\/019459989210700106"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00701-002-1021-7"},{"key":"e_1_2_6_8_1","doi-asserted-by":"publisher","DOI":"10.1227\/00006123-200106000-00010"},{"key":"e_1_2_6_9_1","doi-asserted-by":"publisher","DOI":"10.3171\/jns.2003.99.4.0685"},{"key":"e_1_2_6_10_1","doi-asserted-by":"publisher","DOI":"10.1055\/s-0033-1333621"},{"key":"e_1_2_6_11_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00701-012-1350-0"},{"key":"e_1_2_6_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.wneu.2016.01.038"},{"key":"e_1_2_6_13_1","first-page":"00","article-title":"Communicating Hydrocephalus Associated with Intracranial Schwannoma Treated by Gamma Knife Radiosurgery","volume":"00","author":"Park C. 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