title: Changes in pyriform sinus morphology in the head rotated position as assessed by 320-row area detector CT.
abstract: In patients with unilateral pharyngeal paresis and dysphagia, the head is rotated to the paretic side to prevent food flow to the rotated side during swallowing. Only a few studies to date have reported on pyriform sinus morphology upon head rotation. The purpose of this study was to measure the volume, depth, and cross-sectional area of the pyriform sinus during head rotation using 320-row area detector computed tomography. We imaged the neck during head rotation at 0° and at 30°, 45°, and 60° to the left or right in nine healthy young adults and determined the volume, depth, and cross-sectional area of the pyriform sinus in each position. On the rotated side, volume and cross-sectional area were significantly decreased at 60°. In contrast, volume, cross-sectional area, and depth were all significantly increased on the opposite side at 60°. These results suggest that head rotation at 60° significantly increases the volume, cross-sectional area, and depth of the opposite side, and significantly decreases the volume and depth of the rotated side of the pyriform sinus.
authors.affiliation: Department of Dysphagia Rehabilitation, Nihon University School of Dentistry, 1-8-13 Surugadai, Kanda, Chiyoda, Tokyo, Japan. nakayama.enri@nihon-u.ac.jp
authors.forename: Enri
authors.initials: E
authors.lastname: Nakayama
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Kagaya
authors.forename: Eiichi
authors.initials: E
authors.lastname: Saitoh
authors.forename: Yoko
authors.initials: Y
authors.lastname: Inamoto
authors.forename: Shuji
authors.initials: S
authors.lastname: Hashimoto
authors.forename: Naoko
authors.initials: N
authors.lastname: Fujii
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Katada
authors.forename: Daisuke
authors.initials: D
authors.lastname: Kanamori
authors.forename: Haruka
authors.initials: H
authors.lastname: Tohara
authors.forename: Koichiro
authors.initials: K
authors.lastname: Ueda
mesh_terms: D000328:Adult; D003679:Deglutition / Q000502:physiology*; D003680:Deglutition Disorders / Q000000981:diagnostic imaging* / Q000503:physiopathology; D005260:Female; D006257:Head / Q000502:physiology*; D006801:Humans; D008297:Male; D010614:Pharynx / Q000000981:diagnostic imaging / Q000503:physiopathology*; D056144:Pyriform Sinus / Q000000981:diagnostic imaging / Q000503:physiopathology*; D012016:Reference Values; D012399:Rotation; D014057:Tomography, X-Ray Computed / Q000379:methods*