CLINICAL DATA The case of a 2-year 5-month white Caucasian infant weighing 13.6 kg and measuring 95 cm high from Jose Bonifacio, Sao Paulo is reported. The infant had been symptomatic for the previous three months with dyspnea at normal effort. The patient was in a good general state, acyanotic, eupneic, ruddy, hydrated and afebrile. The heartbeat was regular with normal sounds and a fixed doubling of the second click, systolic murmur +/6+ at a pulmonary focus with trembling, irradiating to the left armpit. Auscultation of the lungs was symmetrical without adventitious murmurs. The liver was 1 cm from the right costal border. The pulses were symmetrical, without signs of edema and the peripheral oxygen saturation was 99%.