Fig. 3.

Foramen magnum meningioma and petroclival meningioma. A and B, a 53-year-old-male presented with dizziness and vertigo. The T1-weighted coronal MRI (A) with gadolinium shows a right-side lateral foramen magnum meningioma causing mass effect on the brainstem and spinal cord. The patient underwent a right far lateral suboccipital craniotomy with C1 laminectomy and tumor resection. Postoperative coronal MRI (B) demonstrates complete surgical resection. C and D, a 63-year-old male with diplopia, ataxia, and decreased hearing. The T1-weighted axial MRI with gadolinium (C) demonstrates a large left petroclival meningioma causing brainstem compression. Notice that the tumor is infiltrating into the cavernous sinus. The patient underwent a left retrosigmoid craniotomy and tumor resection. The postoperative axial MRI (D) demonstrates gross total resection with excellent decompression of the brainstem. Used with permission from Barrow Neurological Institute.