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Fig. 2D —73-year-old man with history of lung cancer who presented with chemosis of right eye. Clinician had suspected carotid–cavernous fistula. Gadolinium-enhanced T1-weighted MR image with fat suppression shows superior ophthalmic veins appear normal bilaterally. Right orbit exhibits proptosis. Diffuse enlargement of all right extraocular muscles is evident, but tendon insertions are spared. Subtle enhancement is present within intraconal fat. Enhancement along right optic nerve sheath extends to orbital apex (long arrow). Subtle thickening of sclera with mild nodularity (short arrow, C) is evident.