期刊
JOURNAL OF VETERINARY MEDICAL SCIENCE
卷 84, 期 2, 页码 302-305出版社
JAPAN SOC VET SCI
DOI: 10.1292/jvms.21-0446
关键词
calf; conductive hearing loss; congenital ear malformation; temporal bone anomaly
This is a case of congenital malformations of the external and middle ear accompanied by temporal bone anomaly, characterized by bilateral microtia and absent external acoustic meatus.
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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