The authors present two cases of successfully treathed mediastinal pseudocysts of the pancreas. This localisation is very rare (13 cases of te literature). The diagnosis was proved by x-ray examinations: chest PA and profile, esophago-gastroduodenum, scanning of liver, and transthoracic punction of the cyst with laboratory examination (analysis of the cyst liquid). We were two methods of surgically intervention. The method presents two cases at 22 C+internal drainage used in the one case and the method of external drainage in the second. In our opinion, pathophysiological aspects prefer title: pancreas pseudocyst penetrate in the thorax.