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Two representative cases of pseudoprogression of recurrent malignant meningiomas treated by boron neutron capture therapy (BNCT). (A-1–A-4) Gadolinium (Gd)-enhanced MR images of case 50: prior to BNCT (A-1), 48 h after BNCT (A-2) 1 month after BNCT (A-3), and 2 months after BNCT (A-4). (B-1–B-4) Gd-enhanced MR images of case 56: prior to BNCT (B-1), 1.5 months after BNCT (B-2), 2.5 months after BNCT (B-3), and 6 months after BNCT (B-4).
