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Meningioma excised from D8 spinal level showing features of atypical meningioma, WHO Grade II with increased mitotic activity (a, mitotic figures marked by arrows) and elevated Ki-67 labelling index. In contrast, the neoplasm excised from trigone exhibits morphological features of transitional meningioma, WHO Grade I with low Ki-67 labelling index (d). (a and c) Haematoxylin and eosin; (b and d) Immunoperoxidase; Magnification=scale bar (a-d: 20 μm)
