Supravalvar mitral stenosis in a two-year-old cat

Mitral valvular stenosis or supravalvular Mitral stenois (SVMS) is a congenital heart disease rarely diagnosed in cats. It is characterized by narrowing of the valve orifice or by presence of a supravalvular ring causing obstruction to mitral inflow and impaired atrial emptying, leading to increased left atrial pressure and pulmonary edema. Clinical signs include dyspnea, pulmonary hypertension, and arterial thromboembolism due to blood stasis associated with left atrial enlargement. We report the case of a 2-year-old feline with signs of aortic thromboembolism. The presence of supravalvular ring, and turbulent transmitral diastolic flow, confirming the diagnosis of SVMS. The importance of the inclusion of Mitral stenosis in the differential diagnosis of left atrial enlargement and aortic thromboembolism in felines is highlighted.