This patient was very unsteady and had strong positional nystagmus due to removal of her cerebellar nodulus.
[dizziness-and-balance.com]
Clinical features include ataxia, headache, nausea, dizzyness, nystagmus, diplopia, papilledema, etc.
[icd10data.com]
[…] altered mental status, circling, pacing, head pressing, head turn, contralateral postural reaction deficits, blindness Brainstem Altered mental status, circling, head tilt, nystagmus
[vetbook.org]