28th May 2025

A 68-year-old man is admitted to the stroke ward with sudden onset of slurred speech and altered sensation.

A 68-year-old man is admitted to the stroke ward with sudden onset of slurred speech and altered sensation. His past medical history includes hypertension and stable angina. His regular medications are indapamide, amlodipine, aspirin, and simvastatin. On examination, he is dysarthric with dysmetria and nystagmus on the left. He has a markedly ataxic gait and veers to the left. He has reduced sensation to pain and temperature on the left side of his face and the right half of his body.

Of the following options, which is the most likely diagnosis for this man’s presentation?