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Example of ROI placement is shown in a 2-year-old girl with a posterior fossa atypical choroid plexus papilloma. A, Axial T1-spoiled gradient-recalled MR image. B, Axial T2-weighted MR image. C, Contrast-enhanced axial T1-spoiled gradient-recalled MR image shows enhancing mass with a cystic component. D, ASL perfusion map shows ROI placement over the solid tumor and in the contralateral brain not affected by the tumor.
