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Images of a 72-year-old man who presented with left-sided weakness (NIHSS score, 9), scanned 85 minutes after symptom onset. NCCT (A) and CTA-SI (B) show subtle hypoattenuation, inconclusive for acute infarction (white arrows). C, The MTT map demonstrates a perfusion deficit in the right lentiform nucleus (black arrow). The patient received intravenous thrombolysis. D, Follow-up DWI confirms lacunar infarction in the right lentiform nucleus (white arrow).
