Presentation
Cough, lung mass on CXR.
Patient Data
Age: 20 years
Gender: Female
From the case:
Cystic pulmonary hydatidosis
![](https://prod-images-static.radiopaedia.org/images/51688761/52f9e38f69e7cd08befc4fe9f12c71_thumb.jpeg)
![This study is a stack](/packs/stack-YQKLCKBI.gif)
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![This study is a stack](/packs/stack-YQKLCKBI.gif)
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![This study is a stack](/packs/stack-YQKLCKBI.gif)
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![This study is a stack](/packs/stack-YQKLCKBI.gif)
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Info
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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.
Case Discussion
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.