dc.contributor.author | Onyango, Stephen M | |
dc.date.accessioned | 2021-01-25T11:56:21Z | |
dc.date.available | 2021-01-25T11:56:21Z | |
dc.date.issued | 2020 | |
dc.identifier.uri | http://erepository.uonbi.ac.ke/handle/11295/154069 | |
dc.description.abstract | Background: The temporal bone is the centre of otology practice thus understanding its
anatomy and variations is important for diagnosis, treatment and surgical planning in ear
pathology.
Aim: To determine the patterns and prevalence of anatomical variations in temporal bone
anatomy as depicted on high resolution computed tomography (HRCT) scans.
Methodology
Study Sites: The Kenyatta National Hospital and Plaza Imaging Solutions.
Study duration: 12 months
Study Sample Size: 100 participants were recruited where 82 paired temporal bones (TBs)
and 18 unpaired TBs totaling 182 TBs were assessed.
Study Design and Procedure: This was a descriptive cross-sectional study. The study
population included patients who had undergone HRCT of the temporal bone at the two
radiology centres. Their demographic data was collected and their scans were evaluated by the
principal researcher in conjunction with a consultant radiologist in the respective study site.
Variations of the temporal bone were recorded in a data collection sheet.
Data analysis and Results: Data analysis was done using SPSS version 22. The age range was
2-74 years with a mean of 31.6±16.5 years and a male to female ratio of 1:1.1. Anatomical
variations were observed in 99% of participants. The most prevalent variants were type B sinus
tympani (73.1%), prominent sigmoid sinus (70.3%), Korner’s septum (57.1%), petrous
pneumatization (56.5%) and Hans type 4 mastoid pneumatization (47.8%). The least prevalent
variants included large cochlea aqueduct (0.6%), enlarged vestibular aqueduct (1.1%),
petrosquamous sinus (1.1%) and sclerosed petrous (3.3%). Correlation by Fisher’s exact test
showed significant correspondence between mastoid and petrous pneumatization patterns (p
<0.001), male preponderance to large internal auditory canal (p=0.03) and Hans 1 mastoid
pneumatization (p=0.003), and female preponderance to low lying tegmen (p=0.02). Paediatric
petrous pneumatization pattern was predominantly diploe (80%) compared to adults’ aerated
petrous in 62.4% (p <0.003). No observations of aberrant internal carotid artery, persistent
stapedial artery or jugular diverticulum were made.
Conclusion and Recommendation: There is a high prevalence rate of temporal bone
anatomical variants in this study, with significant disparity between gender, age groups and
individuals. These variants must thus be actively sought on case to case basis. | en_US |
dc.language.iso | en | en_US |
dc.publisher | University of Nairobi | en_US |
dc.rights | Attribution-NonCommercial-NoDerivs 3.0 United States | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/us/ | * |
dc.subject | Anatomical variants of the temporal bone as depicted by HRCTS of patients evaluated in two radiology centers in Nairobi. | en_US |
dc.title | Anatomical variants of the temporal bone as depicted by HRCTS of patients evaluated in two radiology centers in Nairobi. | en_US |
dc.type | Thesis | en_US |
dc.description.department | a
Department of Psychiatry, University of Nairobi, ; bDepartment of Mental Health, School of Medicine,
Moi University, Eldoret, Kenya | |