title: [A successful operation for ball valve thrombus].
mesh_terms: D004452:Echocardiography; D005260:Female; D006325:Heart Atria; D006331:Heart Diseases / Q000473:pathology / Q000601:surgery*; D006801:Humans; D008875:Middle Aged; D008946:Mitral Valve Stenosis / Q000150:complications; D013927:Thrombosis / Q000473:pathology / Q000601:surgery*