Anterior ischaemic optic neuropathy in Wegener's granulomatosis.

Is reported a case of Wegener's granulomatosis originally presenting with a clinical picture of temporal arteritis. The presentation included an arteritic anterior ischaemic optic neuropathy occurring with no demonstrable orbital inflammation. The treatment of these two systemic vasculitides is quite different, however, and this case emphasizes the importance of questioning the original diagnosis if the clinical course of the disease does not progress as anticipated.