Considering the common aspects of tissue structure of the aorta and pulmonary artery the authors suggest that in unspecific aortoarteritis in the form of generalized arteriopathy, involvement of pulmonary artery is real. Analysed were 45 autopsy cases. In 31 cases vessel changes of two kinds were seen: destructive-proliferative and sclerotic. Not all cases of sclerotic changes may be explained by lesser circulation hypertension and, thus, the reported data evidence frequent involvement of the pulmonary arteries with development of generalized pathology of the vascular system.