Epidemiological and Etiological Studies on 59 Aural Hematomas of 49 Dogs

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  • 犬４９頭に生じた耳血腫５９例の発生傾向と病因に関する検討
  • イヌ 49トウ ニ ショウジタ ジケッシュ 59レイ ノ ハッセイ ケイコウ ト ビョウイン ニ カンスル ケントウ

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Abstract

Fifty-nine aural hematomas of 49 dogs were reviewed. The number of affected dogs weighing less than 5 kg, 5 to 10 kg, 10 to 20 kg, and more than 20 kg, was 1 (2.1%), 6 (12.8%), 11 (23.4%), and 29 (61.7%), respectively. Golden Retrievers and Labrador Retrievers occupied 55.1% of all the dogs, suggesting the higher risk in these breeds. Of all 59 hematomas, 45 (76.3%) had been suffering from otitis externa and in 52 (88.1%) the onset of this disease was older than 5 years old. Histopathology on the pinna surrounding hematoma revealed partial erosions of the auricular cartilage in all 4 cases examined. These results suggest that there are several risk factors for aural hematoma, including larger-breed dogs (Golden Retrievers and Labrador Retrievers), middle-aged to older dogs, and concurrent otitis externa. In addition, age-related alternation of the auricular cartilage, and potentially self-trauma, may contribute to the occurrence of cartilage fracture resulting in hematoma formation.<br>

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