Hydatid cyst is a serious endemic parasitic disease found in cattle-raising areas of the world. Cardiac hydatid cysts are rare and appear in 0.5% to 2% of hydatid cyst cases. A 24-year-old male patient was admitted to the hospital because of chest pain. A cystic mass (4 4 3 cm) was demonstrated with transthoracic echocardiography, computed tomography, and magnetic resonance imaging. A hydatid cyst was located in the right ventricular wall near the inferior branch of the acute marginal branch of the right coronary artery and was located such that it pushed the tricuspid valve inward. The cystic materials were removed with the patient on cardiopulmonary bypass. The surgery for cardiac hydatid disease is safe, and the results are satisfactory. © 2012 Forum Multimedia Publishing, LLC.