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The clinical diagnosis of transient ischemic attack (TIA) or minor stroke is highly subjective, especially if the brain imaging does not reveal any evidence of ischemic lesion. Herein, I report a case of small vessel TIA and another case of lacunar infarction in which the ischemic lesions were detected with the perfusion-weighted magnetic resonance imaging (MRI). A 76-year-old woman presented with transient right side weakness. She experienced slurred speech and weakness of her right arm and leg for 10 minutes. On neurological examination, she did not show any deficit. The initial multimodal MRI, taken 4 hours after the symptom, revealed no abnormality on diffusion-weighted imaging (DWI) but showed perfusion defect in her left corona radiata and basal ganglia. The intracranial and extracranial magnetic resonance angiography (MRA) did not show significant vascular lesion related to the perfusion defect. The patient did not experience further symptom. However, the follow-up DWI 2 days later revealed diffusion restriction corresponding to the initial perfusion defect (Figure 1A-F). A 66-year-old hypertensive woman presented with the clinical findings of cheiro-oral syndrome. Neurological examination revealed sensory deficit in her left fingers and left hemi-mouth. MRI taken 12 hours after the symptom onset revealed no abnormality on DWI but showed perfusion defect in her right lateral thalamus. MRA did not show any vascular lesion related to the perfusion defect. Her symptom persisted and the follow-up DWI 2 days later showed acute lacunar infarction in the right thalamus, which corresponded to the initial perfusion defect (Figure 1G-L). The identification of ischemic lesion is important among patients with suspected TIA or minor stroke. This report shows Figure 1. Multimodal MRI of patient with TIA (A-F) and cheiro-oral syndrome (G-L). The initial MRI of patient with TIA revealed no significant abnormality on diffusion-weighted imaging (DWI) (A), ADC map (B), and MR angiography (C) but showed perfusion defect in left corona radiata and basal ganglia on timeto-peak (D) and mean-transit-time map (E). The DWI obtained 2 days later revealed diffusion lesion in the left corona radiata and tail of left basal ganglia (F). The initial MRI of patient with cheiro-oral syndrome revealed no abnormality on DWI (G), ADC map (H), and MR angiography (I) but showed time delay in right thalamus on time-to-peak (J) and mean-transit-time map (K). The DWI obtained 2 days later revealed diffusion restriction in right thalamus (L). MRI, magnetic resonance imaging; TIA, transient ischemic attack; ADC, apparent diffusion coefficients; MR, magnetic resonance. A

Small Vessel Transient Ischemic Attack and Lacunar Infarction Detected with Perfusion-Weighted MRI