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Extra-axial lesion of the olfactory groove, homogeneously enhanced on axial and T1-weighted sequences after administration of gadolinium and reformatted in the axial (A and B) and sagittal (C and D) planes. The lesion volume decreased rapidly from 16 cm3 (A and C) on admission to 3 cm3 (81% reduction in volume) at 3 months (not shown) and to 1.9 cm3 (88% reduction in volume) (B and D) at 6 months after hormonal treatment withdrawal.
