Temporal arteritis - Giant cell Arteritis. Inflammatory process assoc with lupus, RA or infections. Unilateral, severe pain, constant. "Classic" S&S tenderness over temporal artery. F:M 3:1, avg onset 65-70 yo. Rare <50, Decr blood supply to optic nerve may cause blindness. Sed rate very high, norm in 20%. Biopsy for confirm. Admit, high-dose steroids, analgesic, neuro consult.