Pulmonary hydatid is caused by larval stage of parasite Echinococcus granulosus. Although surgery still remains the definitive therapy, various workers have tried albendazole and sterilization of cysts with varying result.
Commonest site of cyst is in both lower lobes. X-ray signs include spherical cyst, crescent sign, water lily sign, double arch, pneumonia, hydropneumothorax and blunting of CP angle. In contrast to liver cysts in which calcification occurs in
20 to 30%, calcification of pulmonary hydatid cysts is rare (.07%).
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