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Sagittal and axial pre- and Postcontrast MR images. (a) Sagittal image without gadolinium showing a homogenous lesion in the fourth ventricle. (b) Axial image without gadolinium showing the lesion. (c) Sagittal postcontrast image showing a heterogeneous enhancement of the lesion. (d) Axial postcontrast also showing heterogeneous enhancement.
