[Pancoast and Tobias syndrome of benign etiology (author's transl)].

The authors report a case of Pancoast and Tobias syndrome due to a hydatic cyst on the apex of the left lung. This parasitosis is together with tuberculosis and least infrequent benign etiology of Pancoast and Tobias syndrome. In our observation it was a young cyst without complications as opposed to previously reported cases.