Subacute radiation dermatitis is a cutaneous disorder that occurs secondary to radiation exposure. It occurs after weeks to a few months from radiation exposure. Histologically, subacute radiation dermatitis presents with interface dermatitis that resembles graft-versus-host disease or a fixed drug eruption. The previous reports on this disease have usually been related to extensive or repeated coronary angiography. Herein, we report on a case of subacute radiation dermatitis that occurred 5 weeks after cardiac intervention therapy. (Korean J Dermatol 2010;48(10):866 ∼868)