Hydropneumothorax caused by complete rupture of a pulmonary hydatid cyst: A rare case report.

Hydatid disease is a zoonotic disease endemic in developing regions. It is usually caused by infection with the tapeworm due to contaminated food or drinks or by close contact with dogs. The lungs are the second most affected organ (25%) after the liver (>65%). Cyst rupture is the most frequent complication. Enlarging pulmonary cysts are more vulnerable to rupture, with rupturing in the bronchial tree being the most common (20%-40%). Hydropneumothorax is a consequence of complete cyst rupture into the pleural cavity and occurs in rare cases (2%-4%). Superinfection is a common complication of the ruptured cyst, which might lead to empyema. A 26-year-old male presented to our clinic with dyspnea that had progressed recently and made him unable to walk a few meters. He had a history of cough and exertional dyspnea and was examined by three different clinics without performing a chest X-Ray. Physical examination revealed fever and a sick appearance. Chest X-ray revealed complete pneumothorax with an air-fluid level in the left hemithorax. Computerized tomography demonstrated two cysts, and one of them was ruptured, causing hydropneumothorax and empyema. The patient was treated with surgery, and follow-up showed recovery with a fully re-expanded lung. Rupture of pulmonary hydatid cyst is seen in the most of cases, the clinicians must be aware of such presentation and management of the pulmonary hydatid disease.