Hydatid disease is a common parasitic disease affecting humans. The liver is the most common site, followed by the lung. Rupture of cysts can lead to various complications like ascites, pleural effusion, transbiliary and peritoneal seeding.

Transdiaphragmatic involvement of the pleural cavity is a rare occurrence, which can produce secondary cysts in pleura and mediastinum. Hematogenous spread to the lung may also produce pulmonary cysts.