Journal of Veterinary Medical Science
Online ISSN : 1347-7439
Print ISSN : 0916-7250
ISSN-L : 0916-7250

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Congenital malformations of the external and middle ear accompanied by temporal bone anomaly in a calf
Naoyuki AIHARAAnna MOMOKINanase HATTORIHironobu MURAKAMIMotoharu OISHIYoshiaki GOTOReiichiro SATOMakoto NAGAIKazutaka YAMADAJunichi KAMIIE
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JOURNAL OPEN ACCESS Advance online publication

Article ID: 21-0446

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Abstract

A 7-month-old female Holstein calf presented with bilateral microtia and absent external acoustic meatus. The real-time polymerase chain reaction test was negative for bovine viral diarrhea virus and bovine leukemia virus. The calf’s dam had a normal reproductive history. Computed tomography confirmed bilateral atresia of external auditory canals, aplasia of tympanic cavities and the ossicular chain, and temporomandibular joint abnormality. Necropsy revealed a severe malformation of the temporal bone. In the tympanic region, the external acoustic pore, tympanic bulla, and muscular process were absent bilaterally. The bilateral inner ear structure was normal. Based on these findings, we diagnosed the present case as congenital malformations of the external and middle ear accompanied by temporal bone anomaly.

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© 2022 by the Japanese Society of Veterinary Science

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