{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,21]],"date-time":"2026-08-21T13:23:41Z","timestamp":1787318621265,"version":"build-2736575974"},"reference-count":39,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2023,4,1]]},"abstract":"<jats:sec>\n                    <jats:title>OBJECTIVE<\/jats:title>\n                    <jats:p>Preservation of neurological function is a priority when performing a resection of a vestibular schwannoma (VS). Few studies have examined the radiographic value of a fundal fluid cap\u2014i.e., cerebrospinal fluid in the lateral end of a VS within the internal auditory canal\u2014for prediction of postoperative neurological function. The aim of this study was to clarify whether the presence of a fundal fluid cap on preoperative magnetic resonance images has a clinical impact on facial nerve function after resection of VSs.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>METHODS<\/jats:title>\n                    <jats:p>The presence of a fundal fluid cap and its prognostic impact on long-term postoperative facial nerve function were analyzed.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>RESULTS<\/jats:title>\n                    <jats:p>A fundal fluid cap was present in 102 of 143 patients who underwent resection of sporadic VSs via the retrosigmoid approach. Facial nerve function was acceptable (House-Brackmann grade I\u2013II) immediately after surgery in 82 (80.4%) patients with a fundal fluid cap and in 26 (63.4%) of those without this sign. The preservation rate of facial nerve function increased in a time-dependent manner after surgery in patients with a fundal fluid cap but plateaued by 3 months postoperatively in those without a fundal fluid cap; the difference was statistically significant at 12 months (96.1% vs 82.9%, p = 0.013) and 24 months (97.1% vs 82.9%, p = 0.006) after surgery. The presence of a fundal fluid cap had a significantly positive effect on long-term facial nerve function at 24 months after surgery when tumor size and intraoperative neuromonitoring response were taken into account (OR 5.55, 95% CI 1.12\u201327.5, p = 0.034).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>CONCLUSIONS<\/jats:title>\n                    <jats:p>Neuromonitoring-guided microsurgery for total resection of VSs is more likely to be successful in terms of preservation of facial nerve function if a fundal fluid cap is present. This preoperative radiographic sign could be helpful when counseling patients and deciding the treatment strategy.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3171\/2022.8.jns221516","type":"journal-article","created":{"date-parts":[[2022,10,12]],"date-time":"2022-10-12T14:42:25Z","timestamp":1665585745000},"page":"972-980","source":"Crossref","is-referenced-by-count":11,"title":["Presence of a fundal fluid cap on preoperative magnetic resonance imaging may predict long-term facial nerve function after resection of vestibular schwannoma via the retrosigmoid approach"],"prefix":"10.3171","volume":"138","author":[{"given":"Yuichi","family":"Fujita","sequence":"first","affiliation":[{"name":"Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Hyogo; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yoichi","family":"Uozumi","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Hyogo; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takashi","family":"Sasayama","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Hyogo; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eiji","family":"Kohmura","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Hyogo; and"},{"name":"Department of Neurosurgery, Kinki Central Hospital, Itami, Hyogo, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1754","reference":[{"issue":"14","key":"b1","series-title":"N Engl J Med","first-page":"1335","article-title":"Vestibular schwannomas","volume":"384","author":"Carlson ML","year":"2021","unstructured":"Carlson ML, Link MJ. 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