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The cyst content showed a high intensity on both (a) T1- and (b) T2-weighted images. MRI in the third month revealing a cystic lesion with ring enhancement (c). ASL of the lesion showing a decrease of cerebral blood flow (d). (e) MRI obtained 16 months after onset demonstrating the mass size slightly decreasing and perifocal edema improving. The intensity of the content has not significantly changed from the MRI in the third month.
