Long term evolution of valvular rheumatic disease may lead to clinical complications that can be the first clinical manifestation. Even in patients with mild valvular disease, the rigorous follow up it is the main way to avoid such complications. Emergency conditions as embolic events may be a life-threatening situation with challenging treatment. This is a case report of a 57-year-old woman who had embolic events that led to the diagnosis of mitral stenosis complicated by ball thrombus.