Abstract
A 17-day-old female Holstein calf exhibited the following neurological symptoms : the calf bent its neck to the left，turning its face backward and could stand alone，but would fall within a short time. Neurological examination further revealed losses of pupillary light reflex，menace response，palpebral reflex，and hearing on the right side. After administration of dexamethasone and vitamin B1，the calf was able to walk on day 7 after the onset of symptoms ; however，the head tilting and circling to the left could not be normalized，and the calf showed no improvement in neurological symptoms. The calf was euthanized on day 7，and pathological changes were examined. An abscess (diameter，1 cm) was found on the right side of the vertical section of the pons，and Fusobacterium necrophorum was cultivated from the abscess. The clinical symptoms，including head tilting to the left and hearing disturbance，were thought to be caused by the abscess pressing on cranial nerves，including the vestibulocochlear nuclei.
