Wegener's granulomatosis presenting as temporal arteritis. A granulomatous giant cell vasculitis of the temporal artery was observed in a biopsy specimen from a patient with corresponding clinical symptoms. Within weeks, the new onset of pulmonary infiltrates and renal failure prompted biopsy of the patient's kidney. A necrotizing glomerulonephritis, compatible with a diagnosis of Wegener's granulomatosis, was present. Vasculitis of the temporal artery may be a feature of Wegener's granulomatosis. 