Optic nerve sheath meningioma Case 1Case 2Case 3Case 4 40-year-old patient presenting with left sided proptosis. MRI showed an avidly enhancing lesion filling the orbital apex and encasing the optic nerve. 45-year-old female with eccentric enhancement of the left optic nerve sheath near the orbital apex. There was very high uptake on the Ga-DOTATATE PET scan. 35-year-old patient developed worsening orbital swelling during pregnancy. An enhancing mass lesion along the inferior aspect of the optic nerve sheath, causing 2 mm of proptosis, was avid on Ga-DOTATATE PET. 30-year-old patient presented with proptosis but no visual symptoms. MRI showed proptosis secondary to a large enhancing lesion encasing the optic nerve (red arrow).