RADIOGRAPHIC AND COMPUTED TOMOGRAPHIC ASSESSMENT OF CHRONIC OTITIS EXTERNA AND ITS SURGICAL MANAGEMENT IN DOGS
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Date
2021
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Abstract
Twelve cases of chronic otitis externa that presented to the Small Animal Out-patient unit of Madras Veterinary College Teaching Hospital were chosen for this study. They were randomly divided into two groups of six animals each. Lateral ear canal resection was performed in animals of group I, and vertical ear canal
ablation was performed in animals of group II. Cytology, culture, and antibiotic sensitivity was done on day 0 and the 14th post-operative day. Radiography and computed tomography (CT) were done on day 0 and the 30th post-operative day.
Dorso-ventral and lateral oblique orthogonal views of the skull were taken on radiography to assess the external ear canal and the tympanic bulla. CT was done with a 16-slice helical CT scanner with 1mm slice thickness and slice interval. Images were assessed in both the bone and soft tissue windows. Parameters measured were the length of the vertical canal, length of the horizontal canal, diameter at the external auditory meatus, diameter at the junction of the vertical and horizontal canal, diameter at the proximal end of the horizontal canal, presence of soft tissue opacity within the lumen of the horizontal canal, presence of mineralization and presence of narrowing of the external ear canal. Additionally, the maximum thickness of the vertical and horizontal canal was measured on CT.