{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,6]],"date-time":"2026-11-06T23:53:30Z","timestamp":1794009210765,"version":"4.8.0"},"reference-count":71,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"5","license":[{"start":{"date-parts":[[2018,5,21]],"date-time":"2018-05-21T00:00:00Z","timestamp":1526860800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"funder":[{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Neurosurg.","NEUROS"],"published-print":{"date-parts":[[2019,5]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>BACKGROUND<\/jats:title>\n                    <jats:p>Epidemiology can assess the effect of Chiari I malformation (CM1) on the neurological health of a population and evaluate factors influencing CM1 development.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>OBJECTIVE<\/jats:title>\n                    <jats:p>To analyze the regional and ethnic differences in the prevalence of CM1.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>METHODS<\/jats:title>\n                    <jats:p>The population of the Republic of Tatarstan (RT) in the Russian Federation was evaluated for patients with CM1 symptoms over an 11-yr period. Typical symptoms of CM1 were found in 868 patients. Data from neurological examination and magnetic resonance imaging (MRI) measurement of posterior cranial fossa structures were analyzed.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>RESULTS<\/jats:title>\n                    <jats:p>MRI evidence of CM1, defined as cerebellar tonsils lying at least 5 mm inferior to the foramen magnum, was found in 67% of symptomatic patients. Another 33% of symptomatic patients had 2 to 4 mm of tonsillar ectopia, which we defined as \u201cborderline Chiari malformation type 1 (bCM1).\u201d The period prevalence in the entire RT for symptomatic CM1 was 20:100 000; for bCM1 was 10:100 000; and for CM1 and bCM1 together was 30:100 000. Prevalence of patients with CM1 symptoms was greater in the northern than southern districts of Tatarstan, due to a high prevalence (413:100 000) of CM1 in the Baltasy region in one of the northern districts.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>CONCLUSION<\/jats:title>\n                    <jats:p>One-third of patients with typical symptoms of CM1 had less than 5 mm of tonsillar ectopia (bCM1). Assessments of the health impact of CM1-type symptoms on a patient population should include the bCM1 patient group. A regional disease cluster of patients with Chiari malformation was found in Baltasy district of RT and needs further study.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1093\/neuros\/nyy175","type":"journal-article","created":{"date-parts":[[2018,4,9]],"date-time":"2018-04-09T07:09:06Z","timestamp":1523257746000},"page":"1090-1097","source":"Crossref","is-referenced-by-count":34,"title":["Epidemiology of Symptomatic Chiari Malformation in Tatarstan: Regional and Ethnic Differences in Prevalence"],"prefix":"10.1227","volume":"84","author":[{"given":"Enver I","family":"Bogdanov","sequence":"first","affiliation":[{"name":"Department of Neurology and Rehabilitation, Kazan State Medical University, Kazan, Republic of Tatarstan, Russian Federation"},{"name":"Department of Neurology, Republican Clinical Hospital, Kazan, Republic of Tatarstan, Russian Federation"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aisylu T","family":"Faizutdinova","sequence":"additional","affiliation":[{"name":"Department of Neurology and Rehabilitation, Kazan State Medical University, Kazan, Republic of Tatarstan, Russian Federation"},{"name":"Clinical Expert Department, Republican Clinical Hospital, Kazan, Republic of Tatarstan, Russian Federation"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elena G","family":"Mendelevich","sequence":"additional","affiliation":[{"name":"Department of Neurology and Rehabilitation, Kazan State Medical University, Kazan, Republic of Tatarstan, Russian Federation"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexey S","family":"Sozinov","sequence":"additional","affiliation":[{"name":"Department of Biological and Medical Ethics, Kazan State Medical University, Kazan, Republic of Tatarstan, Russian Federation"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John 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