[A case report of pulmonary valve blood cyst].

A six-year-old boy with pulmonary stenosis was hospitalized in order to examine the cause of pulmonary stenosis. The right-ventriculography showed a large shadow defect in the right ventricular outflow tract. But the echocardiography showed the cystic tumor, which was covered with thin wall and had echo-free space in it, in the right ventricular outflow tract. We made a diagnosis of pulmonary blood cyst. After cardiopulmonary bypass was established, the main pulmonary artery was incised longitudinally. There were two blood cysts at the left pulmonary cusp which were 1.5 x 1.5 cm and 0.7 x 0.5 cm in size. The cysts were resected and the pulmonary cusp was plicated. Histologically, the wall of the cysts was consisted thick valvular tissues. No pulmonary valve pressure gradient was detected with the echocardiography following the operation.