Multifocal neurological lesion in the dog: what it suggests
4-year-old female toy Poodle, fully vaccinated, with a 10-day history: she has had a seizure, walks in wide circles to the left, has a right head tilt with vertical nystagmus and right-sided postural deficits, and shows pain on neck manipulation.
With this neurolocalisation, which group of causes is most likely?
chevron_right Show answer and explanation
A. Idiopathic epilepsy
It requires a normal interictal neurological examination. Here there are central vestibular deficits, forebrain signs and neck pain.
B. Cervical disc herniation
It would explain the neck pain, but not the seizure, the circling or the central vestibular syndrome.
C. Inflammatory (meningoencephalitis of unknown origin) or infectious disease
Correct. No single lesion explains the left forebrain, right brainstem and cervical meninges: the localisation is multifocal. In a young small-breed female dog, meningoencephalitis of unknown origin is most likely; rule out infectious causes such as distemper, toxoplasmosis or neosporosis.
D. Metabolic or toxic encephalopathy
Metabolic and toxic causes usually produce diffuse, symmetrical signs, not lateralised deficits in several regions or neck pain.
lightbulb Key takeaway
Always try to explain all the signs with a single lesion; if that is not possible, the localisation is multifocal. Multifocal, asymmetrical lesions point to inflammation, infection or metastatic neoplasia. The next step is MRI and cerebrospinal fluid analysis, ideally before giving corticosteroids.
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Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.