Abstract In reviewing the literature 169 cases of echinococcosis of the heart were mentioned. In a series of 257 patients with hydatid disease admitted to the American University Hospital of Beirut, Lebanon, the liver was involved in 51.7 per cent, the lung in 29.9 per cent, the kidneys in 5.8 per cent, the spleen in 4.67 per cent, the soft tissues in 3.5 per cent, and the periotneum in 2.7 per cent of the cases. One cyst was also found in each of these, the spinal cord, biliary tree, and orbit. The thyroid in one case had two cysts. In a series of 720 necropsies, hydatid cysts were found in six. Of these one cyst was found in the heart.