A Case of Un-ruptured Hepatic Hydatid Cyst: A Rare Cause of Eosinophilic Pleural Effusion

Cystic echinococcosis in humans is caused by incidental ingestion of water or food contaminated by embryonated eggs of Echinococcus granulosus. Pleural involvement in hydatid disease occurs through transdiaphragmatic spread or intrapleural rupture of a liver or lung cyst. In rare circumstances, a hydatid cyst may accompany pleural effusion. Here, we report a rare case that presented to us with right-sided gross pleural effusion. On evaluation, a large hydatid cyst was found in the left lobe of the liver without any sign of intrapleural or transdiaphragmatic rupture. The pleural fluid was exudative, eosinophilic, and had raised adenosine deaminase. This case depicts the rare presentation of disease and highlights the importance of clinical examination.