Aural CT characteristics of American Cocker Spaniels have features of both mesaticephalic and brachycephalic breeds

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Kaimio , M L M , Lappalainen , A K , Rahmani , V , Männikkö , S & Laitinen-Vapaavuori , O M 2020 , ' Aural CT characteristics of American Cocker Spaniels have features of both mesaticephalic and brachycephalic breeds ' , Veterinary Radiology & Ultrasound , vol. 61 , no. 6 , pp. 649-658 . https://doi.org/10.1111/vru.12900

Title: Aural CT characteristics of American Cocker Spaniels have features of both mesaticephalic and brachycephalic breeds
Author: Kaimio, Mirja L. M.; Lappalainen, Anu K.; Rahmani, Vahideh; Männikkö, Sofia; Laitinen-Vapaavuori, Outi M.
Other contributor: University of Helsinki, Departments of Faculty of Veterinary Medicine
University of Helsinki, Equine and Small Animal Medicine
University of Helsinki, Equine and Small Animal Medicine





Date: 2020-11
Language: eng
Number of pages: 10
Belongs to series: Veterinary Radiology & Ultrasound
ISSN: 1058-8183
DOI: https://doi.org/10.1111/vru.12900
URI: http://hdl.handle.net/10138/333216
Abstract: Otitis externa and otitis media are common in American Cocker Spaniels, however breed-specific aural CT descriptions are currently lacking. This prospective and retrospective, observational, analytical study aimed to describe quantitative CT characteristics of the horizontal ear canal and the tympanic bulla in American Cocker Spaniels versus similar-sized mesaticephalic dogs. We prospectively performed clinical examinations and aural CT scanning for 38 American Cocker Spaniels. Computed tomographic transverse area of the osseous horizontal ear canal (TA1), transverse area of the widest air-filled part of the cartilaginous horizontal ear canal (TA2), tympanic bulla volume, and tympanic bulla wall thickness were measured. The TA1 and TA2 measurements were compared with those of 23 retrospectively recruited, similar-sized mesaticephalic dogs that had undergone CT-scanning of the head for non-ear-related reasons. The TA1 and TA2 did not differ for healthy American Cocker Spaniels and mesaticephalic dogs. Severely affected American Cocker Spaniels had significantly smaller TA2 (P <.001). The intraclass correlation coefficient for intraobserver and interobserver repeatability was 0.972 and 0.983 for TA1 and 0.994 and 0.998 for TA2, respectively. Variation between individuals was subjectively noted in healthy and affected American Cocker Spaniels, but mean tympanic bulla volume was slightly smaller in relation to body weight, and the tympanic bulla wall was thicker than in previous reports for mesaticephalic dogs. The tympanic bulla wall appeared thicker rostro-ventrally than caudo-ventrally in 44% of the dogs. Our results imply that a relatively thick tympanic bulla wall may be a normal CT variation and should be interpreted cautiously in this breed.
Subject: canine
middle ear
otitis externa
otitis media
EAR CANAL ABLATION
LATERAL BULLA OSTEOTOMY
CANINE OTITIS-EXTERNA
MIDDLE-EAR
COMPUTED-TOMOGRAPHY
DOGS
DIAGNOSIS
PREVALENCE
DISEASE
MEDIA
413 Veterinary science
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