Acquired Brown syndrome: report of two cases.

We report 2 cases of acquired Brown syndrome, each associated with a mass in the supranasal area of the involved eye. Meticulous endoscopic surgery of an ethmoidal mucocele in the first case resulted in the recovery of superior oblique muscle function. Imaging studies suggested the presence of an orbital venous malformation in the second case, the clinical course of which was stable, with minimal intermittent diplopia over time.