ECHINOCOCCUS DISEASE

Abstract

One hundred and twelve patients with hydatid cyst who have been operated upon at Teheran University Hospitals, Teheran, Iran, during the years 1946-1953 are reviewed, and compared to 611 cases of hydatid cyst from the United States reported up to 1965. Roentgen examination is the most helpful diagnostic method for demonstrating Echinococcus cyst. The liver is the most common site of involvement. Pulmonary cysts are the second in frequency in both series. Hydatid cysts of the liver may produce extrinsic pressure upon the neighboring organs. Localized polycyelic calcification of the liver is characteristic of Echinococcus cyst. Unruptured pulmonary cysts, single or multiple, appear as rounded or ovoid densities. The undulating membrane or water lily sign is pathognomonic of ruptured lung cysts. Pulmonary cysts do not calcify. Hydatid cysts may be found in the peritoneum, kidney, spleen, bone, brain, spine, heart and almost any other organ in the body. The roentgen manifestations of the cyst in these organs are discussed.