Two cases of skin necrosis following extravasation of contrast media for intravenous pyelography and computed tomographywere experienced in the Dept. of Radiology, Seoul National Univ. Hospital. The first case was 4 years old girl who suffered from known nephrotic syndrome. About 15 cc of meglumine ioxitalamate was injected through 25G needle at dorsum of left foot In both cases the dorsum of foot was swollen immediately after the extravastion of the contrast media. Following discoloration the skin showed vesicles with erythema. Consequently the skin sowed white discoloration and ulcerated to form crust. In the former case, skin graft was applied successfully. However, in the latter, the lesion healed with only supportive dressings.