Figure 2

MRI of the patient's brain before and after the BNCT. White arrows indicate a venous angioma, which was recognized incidentally and judged as a sectional standard of MRI. A: Gd-enhanced T1-weighted MRI of the brain 1 month before the BNCT. There was a subcutaneous and epidural tumor mass. B: Gd-enhanced T1-weighted MRI at 4 days after BNCT. The tumor mass was reduced. C: Gd-enhanced T1-weighted MRI of the brain 3 months after BNCT. The tumor mass was further reduced. A': Fluid-attenuated inversion recovery (FLAIR) MRI of the brain 1 month before BNCT. B': FLAIR MRI of the brain 4 days after BNCT. The tumor mass was reduced, but the edema had worsened. A black arrow indicates the cerebellar edema. C': FLAIR MRI of the brain 3 months after BNCT. The tumor mass was further reduced, and the edema had disappeared.