MRI scan of head in sagittal plane MR scan showing an enhancing mass which a meningioma growing from the meninges at the edge of the foramen magnum. The tumour is benign but is causing compression of the brain stem and secondary hydrocephalusMR scan showing an enhancing mass which is a meningioma growing from the meninges at the edge of the foramen magnum. The tumour is benign but is causing compression of the brain stem and secondary hydrocephalus. MRI scan of head in sagittal plane