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The patient's symptoms and findings are highly indicative of a cerebellar stroke. Sudden severe occipital headache, vertigo, and difficulty walking (ataxia) are classic symptoms of cerebellar dysfunction. Nystagmus is a common neurological sign associated with cerebellar or brainstem lesions. The most definitive finding is the MRI showing infarction in the cerebellum. An infarction is tissue death due to lack of blood supply, which is the definition of a stroke. When this occurs in the cerebellum, it is specifically called a cerebellar stroke. The correct option is D. D. Cerebellar Stroke Send me the next one 📸