Simpson D
Department of Veterinary Clinical Sciences, University of Sydney, New South Wales.
Aust Vet J. 1997 Jan;75(1):18-20. doi: 10.1111/j.1751-0813.1997.tb13820.x.
A 3 year old, female great Dane with atresia of the right external ear canal had recurrent episodes of ear pain. Radiography revealed absence of air in the right external acoustic meatus, thickened bone of the right tympanic bulla and increased radiodensity of the chamber of the bulla. Total ear canal ablation and lateral bulla osteotomy were performed. The superficial portion of the external ear canal was absent and the deeper segment of the vertical ear canal began as a blunt ended cartilage tube. A patent lumen in the existent portion of the external ear canal and the tympanic bulla contained wax, hair and exfoliated squames. The tympanic membrane was not intact. No bacteria were cultured from the contents of the external and middle ear. The dog responded well to surgery and was free of pain 11 months later. Failure to surgically correct atresia of the ear canal in young dogs may allow the accumulation of cellular and sebaceous debris with subsequent involvement of the middle ear in an inflammatory response.
一只3岁的雌性大丹犬，右侧外耳道闭锁，耳部反复疼痛。放射检查显示右侧外耳道无空气，右侧鼓泡骨增厚，鼓泡腔的放射密度增加。进行了全耳道切除术和外侧鼓泡截骨术。外耳道浅部缺失，垂直耳道深部起始为钝端软骨管。外耳道现存部分和鼓泡内的一个通畅管腔含有耵聍、毛发和脱落的鳞屑。鼓膜不完整。外耳道和中耳内容物未培养出细菌。这只狗对手术反应良好，11个月后无疼痛症状。幼犬耳道闭锁若未通过手术矫正，可能会导致细胞和皮脂腺碎屑积聚，继而中耳发生炎症反应。
