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Summary
A survey of factors which predispose the canine ear to otitis externa is presented In restected ear specimens of 106 dogs, otitis externa without tumour was found on 58 occasions. In 46 dogs tumours were diagnosed in 15 cases with an ototis externa. In two dogs an inflammatory polyp was found.
In the resected ear specimens of 48 cats, otitis externa was diagnosed 27 times, in 6 cases combined with an inflammatory polyp. In 21 cases neoplasia was present.
The otitis externa was mainly a chronic proliferative inflammation characterised by hyperkeratinisation, hyperplasia of the sebaceous and ceruminous glands, fibrosis and infiltration with plasma cells, lymphocytes and macrophages, often containing ceroid pigment.
Notes
Department of Veterinary Pathology, Faculty of Veterinary Medicine, State University Utrecht, Postbox 80.158, 3508 TD Utrecht, The Netherlands