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However, TD occurs in some patients with normal\u2010sized PCF and, conversely, some patients with borderline or no TD have small PCF. We thus sought to identify a set of prototypic PCF measures for the diagnosis of CMI.<\/jats:p><\/jats:sec><jats:sec><jats:title>METHODS<\/jats:title><jats:p>We performed nineteen measurements of the PCF on sagittal MRI of 100 cases with cerebellar TD \u22655 mm and 50 control individuals, compared the average values in both cohorts and used logistic regression to devise a probability model to predict CMI status.<\/jats:p><\/jats:sec><jats:sec><jats:title>RESULTS<\/jats:title><jats:p>Significant decrements were detected for several PCF\u2010related measures in the patients\u2019 cohort. We developed a probability model that combined seven of these parameters to predict diagnosis with 93% sensitivity and 92% specificity.<\/jats:p><\/jats:sec><jats:sec><jats:title>CONCLUSIONS<\/jats:title><jats:p>The addition of simple morphometric measurements in the diagnostic work\u2010up of patients with suspected CMI may facilitate radiological diagnosis. Moreover, identification of the subset of CMI that arise from basichondrocranium underdevelopment is important for both, selection of the most appropriate therapeutic approach as well as proper CMI categorization in research studies.<\/jats:p><\/jats:sec>","DOI":"10.1111\/jon.12007","type":"journal-article","created":{"date-parts":[[2013,1,16]],"date-time":"2013-01-16T19:57:25Z","timestamp":1358366245000},"page":"250-256","source":"Crossref","is-referenced-by-count":63,"title":["MRI\u2010based Morphometric Analysis of Posterior Cranial Fossa in the Diagnosis of Chiari Malformation Type I"],"prefix":"10.1111","volume":"24","author":[{"given":"Aintzane","family":"Urbizu","sequence":"first","affiliation":[{"name":"Pediatric Neurology Research Group, Vall d'Hebron Research Institute, Universitat Aut\u00f2noma de Barcelona"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maria\u2010Antonia","family":"Poca","sequence":"additional","affiliation":[{"name":"Department of 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