Cardiac hydatid cyst in the interventricular septum leading to symptoms of subaortic stenosis

A 44-year-old man presented with a complaint of dyspnea on exertion. Transthoracic two-dimensional echocardiography showed a cystic lesion in the basal region of the interventricular septum, 4.5x8 cm in size, suggesting a hydatid cyst. Color Doppler echocardiography demonstrated turbulent flow and mild aortic and mitral insufficiency. An indirect hemagglutination test yielded a positive result. The patient refused surgical treatment. A month later, it was found that he had died during surgery for the hydatid cyst at another center.