A 57-year-old, right-handed woman was admitted to our hospital with complaints of behavioral disturbance. The patient had been well until 1 day before admission, when she noted memory disturbance, mild disorientation, and word-finding difficulty. On admission, her level of consciousness was normal, and her Mini-Mental State Exam (MMSE) score was 24/30. There were no motor or sensory deficits. Neuropsychological assessment revealed mild impairments in attention, verbal fluency, memory, and frontal function. On T2-weighted and diffusion-weighted MR images, a small, high-signal-intensity lesion was observed in the left basal ganglia, mainly the left globus pallidus (Figure 1). A SPECT study showed a slight decrease in blood flow in the left basal ganglia without a decrease in the adjacent cortical blood flow. After admission, she was treated with anti-platelet agents, and her symptoms improved gradually. At her 1-month follow-up, the findings of neuropsychological evaluations were significantly improved, albeit with a residual slight memory deficit (Table 1).