[Prinzmetal's angina. Histological study of peroperative coronary specimens. Apropos of 2 cases].

The results of histological examination of two coronary artery biopsy specimens removed at operation are presented. There were unusual findings, especially of a highly cellular and oedematous fibroblastic endarteritis, of the lack of calcification, and of the presence of marked medial sclerosis. These unusual histological findings are the result of solitary variable stenoses of the coronary arterial tree, and very different from the histological findings in the atheromatous lesions which are usually found when Prinzmetal's angina is super-imposed on lesions which are multiple and diffuse.