title: An imaging study of the facial nerve canal in congenital aural atresia.
abstract: We conducted a prospective study to investigate the abnormalities of the facial nerve canal in patients with congenital aural atresia by computed tomography (CT). Our study population was made up of 99 patients--68 males and 31 females, aged 6 to 22 years (mean: 13.5)--who had unilateral congenital aural atresia without any inner ear malformations. We compared our findings in these patients with those in 50 controls-33 males and 17 females, aged 5 to 22 years (mean: 15.0)-who had normal ears. We classified the congenital aural atresia patients into three groups (A, B, and C) according to their Jahrsdoerfer grading scale score (≥8; 6 or 7; and ≤5, respectively). The course of the facial nerve canal in both the controls and the study patients was determined by temporal bone CT with multiplanar reconstruction. The distances from different parts of the facial nerve canal to surrounding structures were also measured. The course of the facial nerve canal in the normal ears did not vary much, and there were no statistically significant differences according to head side and sex. In groups B and C, the tympanic segment, mastoid segment, and angle of the second genu of the facial nerve canal were all significantly smaller than those of the controls (p < 0.01 in all cases). Statistically, the tympanic segment of the facial nerve canal in patients with congenital aural atresia was downwardly displaced. The mastoid segment of the facial nerve canal in these patients was more anterior than that of the controls. We conclude that congenital aural atresia is often accompanied by abnormalities of the facial nerve canal, especially in the tympanic segment, the mastoid segment, and the second genu. We found that the lower the Jahrsdoerfer score was, the shorter the tympanic segment was and the more forward the mastoid segment was.
authors.affiliation: Department of Otolaryngology-Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, No. 1 Dong Jiao Min Xiang Rd., Dong Cheng District, Beijing, China 100730.
authors.forename: Shouqin
authors.initials: S
authors.lastname: Zhao
authors.forename: Demin
authors.initials: D
authors.lastname: Han
authors.forename: Zhenchang
authors.initials: Z
authors.lastname: Wang
authors.forename: Jie
authors.initials: J
authors.lastname: Li
authors.forename: Yanni
authors.initials: Y
authors.lastname: Qian
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Ren
authors.forename: Jiyong
authors.initials: J
authors.lastname: Dong
mesh_terms: D000293:Adolescent; D002648:Child; D000013:Congenital Abnormalities / Q000000981:diagnostic imaging*; D004423:Ear / Q000002:abnormalities* / Q000000981:diagnostic imaging; D005154:Facial Nerve / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D011446:Prospective Studies; D014057:Tomography, X-Ray Computed; D055815:Young Adult