{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T14:12:52Z","timestamp":1787062372345,"version":"build-2736575974"},"reference-count":94,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"3","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2023,3]]},"abstract":"<jats:sec>\n                    <jats:title>OBJECTIVE<\/jats:title>\n                    <jats:p>Management of Chiari malformation type I (CM-I) requires the functional restoration of an obstructed cisterna magna. In posterior fossa decompression with duraplasty (PFDD), various intradural pathologies are suggested to alter CSF flow at the craniocervical junction and require surgical correction. However, reports of the spectrum of intraoperative intradural findings and their nuances are scarce, especially those characterizing rarer findings pertaining to the vascular structures and vascular compression.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>METHODS<\/jats:title>\n                    <jats:p>The authors conducted a retrospective cohort analysis of adults and children who underwent first-time PFDD for CM-I (2011\u20132021), with and without syringomyelia. The surgical reports and intraoperative videos were reviewed, and the frequency and nature of the intradural observations in regard to the tonsils, arachnoid, and vasculature were analyzed along with the clinical findings and surgical outcomes.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>RESULTS<\/jats:title>\n                    <jats:p>All 180 patients (age range 1\u201372 years; median [interquartile range] 24 (14\u201338) years; 37% of patients were children &lt; 21 years of age) exhibited multiple intradural findings, with a median of 7 distinct concurrent observations in each patient. Novel findings not previously reported included posterior inferior communicating artery (PICA) branches compressing the neural elements at the cervicomedullary junction (26.7%). Other common findings included arachnoid adhesions (92.8%), thickening (90.6%), webs at the obex (52.2%), tonsillar gliosis (57.2%), tonsillar hypertrophy (18.3%), adhesions obstructing the foramen of Magendie (FoM) (62.2%), PICA obstruction of the FoM (17.2%), and dural scarring (87.8%). Tonsillar gliosis and intertonsillar adhesions obstructing the FoM were more common in children than adults. Tonsillar gliosis and arachnoid webs were more common among syringomyelia patients. After multivariable adjustment, none of the observed findings were independently associated with syringomyelia, preoperative symptoms, or postoperative improvement. The vast majority of patients improved postoperatively. The complication rate was low: 1.2% of patients required revision PFDD at &gt; 3 years postoperatively, 3.6% experienced other operative complications, and 0% had CSF leaks.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>CONCLUSIONS<\/jats:title>\n                    <jats:p>The diversity of intradural findings and observations revealed in this study suggests that obstructive and compressive structural anomalies may be more common than previously reported among CM-I patients, both those patients with and those without syringomyelia and especially those with obstructive and compressive PICA branches. Although the authors cannot conclude that all these findings are necessarily pathological, further study may determine how they contribute to CM-I pathology and symptomatology in the setting of a compromised cisterna magna.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3171\/2022.12.focus22628","type":"journal-article","created":{"date-parts":[[2023,3,1]],"date-time":"2023-03-01T10:07:02Z","timestamp":1677665222000},"page":"E2","source":"Crossref","is-referenced-by-count":9,"title":["Reappraisal of intradural findings in Chiari malformation type I"],"prefix":"10.3171","volume":"54","author":[{"given":"Belinda","family":"Shao","sequence":"first","affiliation":[{"name":"Department of Neurosurgery, Brown University, Providence, Rhode Island"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel","family":"Wojcik","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Brown University, Providence, Rhode Island"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kevin L.","family":"Ma","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Brown University, Providence, Rhode Island"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Natalie","family":"Amaral-Nieves","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Brown University, Providence, Rhode Island"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jonathan A.","family":"Poggi","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Brown University, Providence, Rhode Island"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Owen P.","family":"Leary","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Brown University, Providence, Rhode Island"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Petra M.","family":"Klinge","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Brown University, Providence, Rhode Island"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1754","reference":[{"key":"b1","series-title":"World Neurosurg","first-page":"e178","article-title":"Intradural pathology causing cerebrospinal fluid obstruction in syringomyelia and effectiveness of foramen magnum and foramen of Magendie dredging treatment","volume":"144","author":"Guan J","year":"2020","unstructured":"Guan J, Yuan C, Zhang C,  Intradural pathology causing cerebrospinal fluid obstruction in syringomyelia and effectiveness of foramen magnum and foramen of Magendie dredging treatment. 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