Fig. 3

A 74-year-old female complaining of double vision. Axial post contrast T1 WI MRI (a, b), The right optic nerve demonstrates the normal anatomy, showing the four segments of the optic nerve, the retinal (red arrow), orbital (arrow head), canalicular (green arrow) and cisternal parts (white arrow). The optic chiasm is also seen (orange arrow). On the left side, ahomogenously enhancing extra axial mass is seen centered on the eroded left greater wing of thesphenoid bone encasing the left optic nerve. Axial CT soft tissue (c) and bone windows (d), axialPET (e), and fused PET/CT (f) images, showing a hypometabolic soft tissue mass causinghyperostosis and erosion of the left greater wing of the sphenoid and extending into the orbitalcavity along the optic nerve. Diagnosis sphenoid wing meningioma with intra orbital extension,encasing the optic nerve