title: Superior semicircular canal dehiscence in relation to the superior petrosal sinus: a potential cause of pulsatile tinnitus.
abstract: OBJECTIVE
  To examine the association between superior semicircular canal dehiscence (SSCD) and pulsatile tinnitus (PT).
  
  
  METHODS
  Two SSCD groups included 408 unilateral persistent PT patients, and 511 controls undergoing head and neck dual-phase contrast-enhanced computed tomography (DP-CECT) for reasons other than PT. The prevalence of type I (no the superior petrosal sinus running through the dehiscence) and type II (superior semicircular canal dehiscence in relation to the superior petrosal sinus) SSCD was analysed using chi-square test.
  
  
  RESULTS
  SSCD was identified in 5.1% (21/408) of PT ears, significantly different from 2% (8/408) of non-PT ears and 0.7% (7/1022) of controls. There was no significant difference in SSCD prevalence between non-PT ears in the PT group and controls. In the PT group, 15/21 ears were type II SSCD; 6/21 ears were type I. Fifteen combined non-PT and control ears with SSCD included two type II and 13 type I SSCD. The prevalence of type II SSCD in PT ears was significantly higher than that of non-PT ears in both groups, and the prevalence of type I SSCD in PT ears was similar to that of non-PT ears in both groups.
  
  
  CONCLUSIONS
  Compared with type I SSCD, there may be a causal relationship between type II SSCD and PT.
authors.affiliation: Capital Medical University, Beijing Tongren Hospital, No. 1 Dong Jiao Min Street, Dongcheng District, Beijing, 100730, China. Electronic address: lzhtrhos@163.com.
authors.forename: Z
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Shandong Medical Imaging Research Institute, No. 324 Jing 5 Road, Jinan, 250021, China.
authors.forename: W
authors.initials: W
authors.lastname: Bi
authors.affiliation: Capital Medical University, Beijing Tongren Hospital, No. 1 Dong Jiao Min Street, Dongcheng District, Beijing, 100730, China.
authors.forename: J
authors.initials: J
authors.lastname: Li
authors.affiliation: Capital Medical University, Beijing Tongren Hospital, No. 1 Dong Jiao Min Street, Dongcheng District, Beijing, 100730, China.
authors.forename: Q
authors.initials: Q
authors.lastname: Li
authors.affiliation: Capital Medical University, Beijing Friendship Hospital, No. 95 Yongan Road, Xicheng District, Beijing, 100050, China.
authors.forename: C
authors.initials: C
authors.lastname: Dong
authors.affiliation: Capital Medical University, Beijing Friendship Hospital, No. 95 Yongan Road, Xicheng District, Beijing, 100050, China.
authors.forename: P
authors.initials: P
authors.lastname: Zhao
authors.affiliation: Capital Medical University, Beijing Friendship Hospital, No. 95 Yongan Road, Xicheng District, Beijing, 100050, China.
authors.forename: H
authors.initials: H
authors.lastname: Lv
authors.affiliation: Capital Medical University, Beijing Friendship Hospital, No. 95 Yongan Road, Xicheng District, Beijing, 100050, China. Electronic address: cjr.wzhch@vip.163.com.
authors.forename: Z
authors.initials: Z
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D003287:Contrast Media; D005260:Female; D006801:Humans; D007479:Iopamidol; D007759:Labyrinth Diseases / Q000150:complications* / Q000000981:diagnostic imaging / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012665:Semicircular Canals / Q000000981:diagnostic imaging / Q000473:pathology*; D014012:Tinnitus / Q000000981:diagnostic imaging / Q000453:epidemiology / Q000209:etiology*; D014057:Tomography, X-Ray Computed
chemical_list: D003287:Contrast Media; D007479:Iopamidol