title: [Normal anatomy of aditus of antrum and antrum on high-resolution CT and three-dimensional reconstruction].
abstract: OBJECTIVE
  To study the normal anatomy of aditus of antrum and antrum on the high-resolution CT (HRCT) and the three-dimensional reconstruction, testing the normal range. And comparison was carried out according to the age, sex and side.
  
  
  METHODS
  Ninety cases were randomly selected without ear lesions. Scanning were taken in sagittal, transverse and coronal planes on HRCT respectively. The structure of aditus and antrum was displayed by three-dimensional reconstruction. The left-right distances and up-down distances, antero-posterior distances were measured and analyzed.
  
  
  RESULTS
  The image of antrum varied with age, while aditus remained constant on the HRCT and the three-dimensional reconstruction. The average of left-right distance of aditus was (5.19 +/- 1.39) mm, and the average of up-down distance of aditus was (5.74 +/- 1.16) mm. The average of left-right distance of antrum was (8.27 +/- 1.41) mm (<6 years old) and (5.41 +/- 1.32) mm (> or = 6 years old). The average of up-down distance of antrum was (11.78 +/- 1.65) mm (<6 years old) and (9.91 +/- 2.04) mm (> or = 6 years old). The average of antero-posterior distance of antrum was (12.25 +/- 1.23) mm (<6 years old) and (10.05 +/- 1.69) mm (> or = 6 years old). No statistically significant differences were seen in left-right distance of aditus by age, sex and side (P > 0.05). Significant differences in up-down distance of aditus was found between male and female, and the distance in male was greater than that in female (P < 0.05). Statistically significant differences were seen in left-right distance and up-down distance, antero-posterior distance of antrum by age (P < 0.05), but no statistically significant differences by sex or side (P > 0.05).
  
  
  CONCLUSIONS
  Imaging of aditus ad antrum is relatively constant in the normal persons, while the aditus is more diverse. Significant gender differences were seen in up-down distance. There were significant differences in left-right distance, up-down distance, and antero-posterior distance of aditus among all age groups.
authors.affiliation: Department of Otolaryngology-Head and Neck Surgery, Zhujiang Hospital, Southern Medical University, Guangzhou, 510282, China.
authors.forename: Xiaobin
authors.initials: X
authors.lastname: Long
authors.forename: Xiaohua
authors.initials: X
authors.lastname: Feng
authors.forename: Jian
authors.initials: J
authors.lastname: Zhu
authors.forename: Menghe
authors.initials: M
authors.lastname: Guo
authors.forename: Minqiang
authors.initials: M
authors.lastname: Xie
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D004432:Ear, Middle / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007223:Infant; D008297:Male; D014057:Tomography, X-Ray Computed