Echocardiography indicated a myxoma in the right atrium of a 19-year-old male who suffered an episode of syncope. At surgery, a mass containing hydatid cysts was found in the interatrial septum. The patient underwent en bloc resection of the cysts and patch closure of the defect in the interatrial septum. Transient atrioventricular dissociation was observed for 12 hours postoperatively. Subsequent radiography revealed very two small cysts in the lungs, which were treated with albendazol. The patient made a good recovery with no recurrence during the short-term follow-up.
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