CTICasesRuptured Pulmonary Hydatid Cyst
Imaging findings
Chest radiograph and CT show a large, fluid-filled cystic mass in the left lung with a floating membrane and air-fluid level, representing a ruptured hydatid cyst (Echinococcus granulosus) displaying the classic 'water lily sign' (floating collapsed membranes) and 'serpent sign' (collapsed membranes in the dependent portion).
Key takeaways
Hydatid disease is a zoonotic infection caused by Echinococcus tapeworms, common in sheep-raising regions (e.g. Peru, Idaho). Rupture of a pulmonary hydatid cyst into the bronchial tree leads to collapse of the parasite's endocyst membrane, producing the classic 'water lily' or 'Camelot' sign on radiographs and the 'serpent sign' on CT. Management involves surgical cystectomy and anti-helminthic therapy.
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