A 37-year-old man from Morocco, living in France since 2002, was admitted to the hospital in 2008 with a medical history of dyspnoea, hacking cough, and headaches without fever for several weeks. Physical examination at admission revealed jugular turgor leading to the diagnosis of superior vena cava syndrome. Cardiopulmonary auscultation was normal. There were no complaints of abdominal pain. No lymphadenopathy was palpable. During the past year, he had presented several episodes of pruriginous facial edema that were unsuccessfully treated with corticosteroids. Allergologic explorations were negative. His medical history showed nothing unusual, and he was not taking medication. Laboratory blood tests did not reveal blood-cell count abnormalities, inflammatory syndrome, or abnormalities of liver function. Cardiac ultrasound showed several intracardiac multilocular masses of anechoic content with a well-demarcated capsule, which is very typical of a hydatic cyst. A thoracic computed tomography scan revealed the presence of several lesions: the first was compressing the vena cava, and two others were in the left and right ventricles. Further investigation was performed with cardiac magnetic resonance imaging (MRI) ( Figure 1 ).The characteristic radiological findings associated with a positive serology for echinococcosis led us to diagnose cardiac hydatidosis. Differential diagnoses, principally cystic cardiac tumors, were then eliminated. Parasitic infection was confined to the heart and absent in the liver, lungs, and brain. The patient was treated with albendazole (800 mg daily). The evolution of the lesions was monitored with cardiac echography.