Henry Ford Hospital Medical Journal


Excision of a predominantly intracavitary right atrial tumor, which mimicked a number ofother clinical disorders, effected a 20-year cure. Microscopic, ultrastructural, and immunocytochemical characteristics of the tumor were those of smooth muscle; cellular anaplasia, mitotic activity and tumor infiltration of the auricular myocardium indicated malignant neoplasia, a leiomyosarcoma. Distribution of the tumor was consistent with its origin from the auricular endocardium.