High resolution CT study of the chorda tympani nerve and normal anatomical variation

Singh, Dalveer, Hsu, Charlie Chia-Tsong, Kwan, Gigi Nga Chi, Bhuta, Sandeep, Skalski, Matt, and Jones, Rhondda (2015) High resolution CT study of the chorda tympani nerve and normal anatomical variation. Japanese Journal Of Radiology, 33 (5). pp. 279-286.

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Objective: The aim of this study was to define the normal anatomical variation of the course of the CTN through the mastoid temporal bone on high resolution CT (HRCT).

Materials and methods: Retrospective review of 27 consecutive normal HRCT bilateral temporal bones (n = 54, 14 males and 13 females, mean age 41 years) reconstructed at 0.4-mm slice thickness specifically measuring (1) origin of CTN from the posterior genu of the facial nerve (CNVII) and (2) the lateral-most position of the CTN from the mastoid segment of CNVII.

Results: The mean distance of the CTN origin from the mastoid segment of CNVII was 11.5 mm (standard deviation, SD = 3.2, 95 % CI 10.7–12.3) with no statistically significant difference between the left and right side observed (p = 0.08). The most lateral distance of the CTN from CNVII was a mean of 1.3 mm (SD = 0.6, 95 % CI 1.2–1.7), range 0–2.5 mm and again no statistical significance between contralateral sides was observed (p = 0.11). These measurements demonstrated an excellent level of agreement between observers as assessed by intraclass correlation calculation.

Conclusions: Reproducible measurements demonstrate variability of the CTN in both its origin from the mastoid segment of CNVII and its lateral-most course. Precise description of the course of the CTN with HRCT may be useful for planning of otologic surgery and limiting inadvertent nerve injury.

Item ID: 41605
Item Type: Article (Research - C1)
ISSN: 1867-108X
Keywords: chorda tympani nerve; petrous temporal bone; facial nerve, computed tomography
Date Deposited: 08 Dec 2015 14:33
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1199 Other Medical and Health Sciences > 119999 Medical and Health Sciences not elsewhere classified @ 100%
SEO Codes: 92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920111 Nervous System and Disorders @ 100%
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