Air filled cavitary lesion with internal membranous structures noted in right middle lobe. Membranous structures moved anteriorly on prone position.There is communication of the cavity with a bronchus. Right lower lobe and left lung field show tree-in-bud sign suggestive of endobronchial spread (rupture of cyst into bronchus).

Patient had peripheral eosinophilia and positive IgG echinococcal antibody.