Stereotactic Radiosurgery (SRS) Induced Higher-Grade Transformation of a Benign Meningioma into Atypical Meningioma

Figure 1

Neuroimaging–MRI ((a–d) with contrast enhancement) shows (a) sphenoid wing meningioma. (b) Frontobasal tumor projecting towards the right side (pre-SRS). (c) Tumor residual occupying the posterior aspect of the sphenoid wing and parasellar region (post-SRS). (d) Tumor occupies all the right middle cranial fossa extending to the cavernous sinuses, sella, and suprasellar regions as well as right prepontine and CP angle. It is also spread to the ipsilateral right superior orbital fissure and a lesser extent optic canal. The second component within the left anterior cranial fossa crossing the midline to the contralateral side and posteriorly to the left sphenoid ridge (post-SRS).

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