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Cystic hydatid disease is a parasitic infestation caused by the larval/ cyst stage of the Tapeworm ( Echinococcus granulosus) . Dog is the definitive host of this parasite, sheep are the usual intermediate host but humans are accidental intermediate hosts. The organs commonly infested by this parasite are the liver and the lung. Usually the cysts are single and involve the right lobe of the liver. It should be differentiated from other hepatic cysts, liver abcess, biliary obstruction, lung abcess, etc. Ultrasound and CT scan can diagnose the cystic lesion, serodiagnostic assay (ELISA) is helpful in 85% of patients. The treatment consists of PAIR (percutaneous aspiration, infusion of scolicidal agents and reaspiration) for anatomically and surgically appropriate lesions. Surgery remains the treatment of choice for cysts where PAIR is not possible.
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