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Purpose To analyze, from 1.5 Tesla (T) MRI clinical cases, anatomical accessibility of nasopharyngeal tumors through the pharyngobasilar fascia (PBF) to the mandibular nerve for potential perineural spread. Methods A 6-year retrospective review of 1.5 T MR images were rated for tumor involvement of fascial planes and perineural spread in 15 consecutive patients (10 female, 5 male; mean age 45.8 years,...