PMC8720455_01
MRI brain showing 4.2 x 3.6 x 3.5 cm T2 heterogenous (a and b) lesion with contrast Enhancement (d and e). MRI brain with gadolinium demonstrating enhancing intradural Extramedullary lesion at 8th thoracic level.
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F1
The lesion was T1 hypointense and heterogeneously contrasts enhancing [Figure 1].
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 mum)
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F2
Due to the increased mitotic count, this tumor was classified as atypical meningioma, the WHO Grade II [Figure 2].