A case of suspected congenital external auditory canal atresia in a dog
2010
Maruko, R., Osaka Prefecture Univ., Sakai (Japan) | Akiyoshi, H. | Nakanishi, H. | Kuwamura, M. | Yamate, J. | Aoki, M. | Ohashi, F.
A six-year-old, mixed-breed dog presented with swelling of the caudal dorsal portion of the left ear. Clinical examination revealed no external ear opening. CT and MRI examinations indicated that the ear canal and tympanic bulla were filled with material and a cytological examination showed only scales of keratin. Since the left auditory canal was enlarged like a cyst and raised the pressure on the ear, total ear ablation and bulla osteotomy was performed. During the operation, the ear canal and tympanic bulla were founded to be filled with a yellow-green material. A histopathological examination revealed that the epithelium of the ear canal formed a fold and the cerumen had accumulated inside. It was confirmed that the material was scales of keratin. Although secondary inflammation from the keratin was seen, no bacteria were cultured. These results suggest this case to be congenital external auditory canal atresia. The post-surgery healing process was satisfactory.
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