Figure 17 (A and B): Tumors: Optic nerve sheath meningioma: Axial T1 and T2 fat-saturated (A) and coronal T2W and CT scan (B) images of a 59-year-old female with right proptosis since 20 years and progressive loss of vision show T1-isointense and T2-hypointense soft tissue mass surrounding the optic nerve which shows calcification (curved arrow). Also note severe atrophy of prechiasmatic segment of right optic nerve (arrowhead) in the image