Cystic pulmonary hydatidosis
Cough, lung mass on CXR.
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Large cystic mass in the left lower lobe with air-fluid level and decompressed dependent floating membrane. Mild mediastinal and left hilar adenopathy.
Massive left lower lobe cystic mass containing a folded floating membrane, characteristic for hydatid cyst which has decompressed into the airway via a bronchiole (and thus contains air). Hydatid disease in the lung is the second most common site after liver.