Figure 11 (A,B).

Brainstem glioma. A 31-year-old female patient presented with diplopia and squint for 8 months, VII and VIII cranial nerve palsy, and left hemiparesis since 3 weeks. T2W axial image (A) shows a mass (arrow) in the right cerebellopontine angle. A suspicious CSF cleft (arrowhead) is seen. On this image it is not clear whether the mass is intra- or extra-axial. CISS axial image (B) shows that the adjacent nerves and vessels are pushed laterally (white arrow), allowing the diagnosis of a brainstem glioma to be made (intraaxial)