PMC5410486_01
MRI findings obtained on the 5th day (A-C), 17th day (D-F), 31st day (G-I), and 51st day (J-L). The symmetric frontal, parietal, and occipital lesions observed on the 5th day were improved on the 17th day. These lesions showed high intensity on FLAIR images (A, D), slight high intensity on DWI (B, E), and high intensity on an ADC map (C, F) (arrowheads). Despite the recovery of the clinical condition, the brain lesions with the same characteristics as those observed earlier reappeared on the FLAIR image (G) and ADC map (I) on the 31st day (arrowheads). These areas were isointense on DWI (H). A part of the frontal lesions showed high intensity on DWI (H) and low intensity on an ADC map (I) (open arrowheads). These small lesions remained on FLAIR imaging (J) (open arrowheads) but were obscure on the DWI (J) (open arrowheads) and ADC map (L).
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These lesions showed slight hyperintensity on diffusion-weighted imaging (DWI) and hyperintensity on an apparent diffusion coefficient (ADC) map (Fig. 1).
MRA findings obtained on the 7th day (A), 33rd day (B), and 51st day (C). The distal portion of the posterior cerebral artery (PCA) was visualized ambiguously on the 7th day. This abnormal finding spread to the proximal portion of the PCA and middle cerebral artery (MCA) on the 33rd day (arrowheads). As with the improvement in the MRI findings, the visualization of the MCA and PCA was nearly normalized on the 51st day.
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On the 7th day, magnetic resonance angiography (MRA) provided ambiguous visualization suggesting vasoconstriction in the bilateral posterior cerebral artery (PCA) (Fig. 2).