[Hydatid cyst of the interventricular septum. Contribution of magnetic resonance imaging]

Cardiac localisation of hydatid cysts is rare representing 0.5 to 2% of all clinical forms of this condition. Hydatid cysts are usually observed in the left ventricle and involvement of the interventricular septum is exceptional. The principal diagnostic and preoperative investigations are serology and imaging by echocardiography and computed tomography, which can give conflicting results. The authors report a case of hydatid cyst of the interventricular septum in which computed tomography was non-contributory whereas echocardiography (the key investigation in all cases of hydatid cyst) associated with nuclear magnetic resonance imaging provided particularly accurate preoperative information. The latter investigation also allowed diagnosis of pulmonary, hepatic, splenic and renal involvement of the disease.