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Patient 34, atypical meningioma in a 73-year-old man. A, Enhanced coronal T1 image shows an en plaque meningioma (arrow) over the left frontoparietal region, with ill-defined margins. B, DW MR image demonstrates the mass to be hyperintense. C, ADC map shows decreased signal intensity compared with normal white matter (absolute ADC = 0.63 × 10−3 mm2/s; NADC ratio = 0.88).
