Lacunar
infarction results from occlusion of the small penetrating arteries at the base
of the brain, including the lenticulostriate and thalamoperforating arteries.
They are smaller infarcts (less than 1 cm) and are found in the basal ganglia,
thalamus and brainstem. MR is far more sensitive than CT for detecting small
lacunar infarcts, particularly in the brainstem where CT scans are often
degraded by artifacts from the bone at the skull base.
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