[en] Comparative studies on the healing of Nd laser burns and thermic injuries of the skin, resp., were performed in X-irradiated and in non-irradiated rats with 2-3% burned body surface. The burns were evaluated pathomorphologically some minutes and on days 7-9, 15, 25, and 30-40 after burning. The healing process of the laser burns did not differ much in X-irradiated rats (LD_52/40) from untreated animals, although the stage of necrotic tissue rejection was prolonged in irradiated rats and there was a distinct participation of lymphohistiocytic elements without marked leukocytic reaction. Laser-treated rats revealed increased radioresistance with survival rates of 86% on day 40 and by 38% significantly higher than in rats with acute radiation sickness