FIG 1. 59-year-old man with hyperemia, proptosis, diplopia, and decrease in visual acuity of the right eye.

A and B, Anteroposterior (A) and lateral (B) views of left ICA injection show an enlarged left MHT (arrow, B), the dorsal meningeal branch of which courses across the midline to supply the CCF (arrows, A).

C and D, Anteroposterior views of the selective left MHT injection, subtracted (C) and unsubtracted (D). The point of fistularization is situated at the left posterior cavernous sinus (arrow, C). Note the catheter tip projects laterally.