Wilbring, Manuel, Utz Kappert, Dirk Daubner, Klaus Matschke, and Sems Malte Tugtekin. 2012. “Metastasizing Primary Atrial Leiomyosarcoma Causing a Functional High-Grade Mitral Stenosis”. The Heart Surgery Forum 15 (2):E108-E110. https://doi.org/10.1532/HSF98.20111147.