[Rare malignant tumors of the lungs (44 cases)].

Since 1963 in the All-Union Research Institute of Clinical and Experimental Surgery 1445 patients with malignant lung tumors were operated upon, in 44 patients (3%) rare tumors were observed. The source of the rare tumors origination was: epithelium--in 14 cases, connective tissue--in 3, vessels--in 10, smooth muscle--in 3, nervous tissue--in 2, hemopoietic tissue--in 6, pleura--in 4. In one observation the tumor showed a mixed genesis, and in one case it exhibited a dysembryogenetic character.