1. Wrisley D, Giambartolomei A, Brownlee W. Left atrial ball thrombus: review of clinical and echocardiographic manifestations with suggestions for management. Am Heart J. 1991;122:1784–90.
2. Yoshida K, Fujii G, Suzuki S, Shimomura T, Miyahara K, Matsuura A. A report of a surgical case of left atrial free floating ball thrombus in the absence of mitral valve disease. Ann Thorac Cardiovasc Surg. 2002;8:316–8.
3. Oryoji A, Kawara T, Hara H, Aoyagi S, Kosuga K, Ohishi K. Left atrial free-floating ball thrombus in a patient without mitral valve disease. Nippon Kyobu Geka Gakkai Zasshi. 1993;41:699–703.
4. Srimannarayana J, Varma RS, Satheesh S, Anilkumar R, Balachandar J. Prevalence of left atrial thrombus in rheumatic mitral stenosis with atrial fibrillation and its response to anticoagulation: a transesophageal echocardiographic study. Indian Heart J. 2003;55:358–61.
5. Thanikachalam S, Sengottuvel G, George S, et al. A case of ball valve thrombus. Echocardiography. 1999;16:143–5.