Extra-axial right-sided meningioma compressing the right parietal and temporal lobes: sagittal T2-weighted (a) and transverse T2-weighted (b), T1-weighted.

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Extra-axial right-sided meningioma compressing the right parietal and temporal lobes: sagittal T2-weighted (a) and transverse T2-weighted (b), T1-weighted pre-contrast (c) and T1-weighted post-contrast (d) images. Extra-axial right-sided meningioma compressing the right parietal and temporal lobes: sagittal T2-weighted (a) and transverse T2-weighted (b), T1-weighted pre-contrast (c) and T1-weighted post-contrast (d) images. This large lesion is causing herniation of the forebrain caudally at the tentorium (a, plain arrow) and of the cerebellum at the foramen magnum (a, dashed arrow). This causes compression of brainstem structures and can lead to clinical signs of brainstem dysfunction, complicating the neurological examination. Critically, however, many animals with radiologically identifiable herniation do not have clinical signs and those with significantly raised intracranial pressure might be missed Francois-Xavier Liebel, and Peter M. Smith In Practice 2014;36:24-29 Copyright © British Veterinary Association. All rights reserved.