Acute lacunar infarct
Right-sided weakness and drift.
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There is a small focus of restricted diffusion within the left insular subcortical white matter consistent with acute lacunar infarct.
Lacunar infarcts are small (<20 mm) infarcts in the distal distribution of deep penetrating vessels. They result from occlusion of one of the small penetrating end arteries at the base of the brain and are due to fibrinoid degeneration.