We report a rare case of a 16-year-old male who had
myxoma originating from septal band of the right ventricle. His ECG anomaly was found incidentally upon a physical examination. Subsequently, echocardiography and angiocardiography demonstrated a
tumor occupying the right ventricular outflow tract and protruding into the main pulmonary artery in systolic phase. He was operated upon using
extracorporeal circulation. By right ventriculotomy the
tumor was resected together with septal tissue 5 mm around the stalk, which branched into the myocardium. The defect was closed using mattress
sutures with
Dacron felt strips. We also analyzed the
DNA content of the
tumor. The
DNA flow cytometry yielded a single cell population with diploid
DNA content. This result showed that the
tumor is sporadic form of cardiac
myxoma. His postoperative course was uneventful. Thirty months after the surgery, patient has no sign of recurrence. The
DNA flow cytometry is helpful for detecting clinical behavior of the cardiac
myxoma, because microscopic examination can not readily distinguish sporadic
myxoma from so-called complex
myxoma.