[Case report: secondary pleural hydatidosis].

Hydatid cyst has a predilection to locate in liver, lungs, and brain. Intrathoracic extrapulmonary locations are generally the mediastinum, pleura, pericardium and chest wall. Pleural involvement usually follows the rupture of a pulmonary or hepatic cyst inside the pleural space causing secondary pleural hydatidosis. Radiological investigations of a patient suffering from cough and dyspnea revealed multiple cysts located in the posterior lower right hemithorax, and implanted in the diaphragmatic pleura and parietal pleura lining the chest wall. He had undergone two hepatic hydatid cystectomy operations. These multiple cysts were removed by thoracotomy. The possibility of secondary pleural dissemination should be considered in patients with lobulated cystic masses as well as a previous hepatic cystic hydatid disease.

Case report: mediastinal hydatid cysts.

Although the intrathoracic location is common for hydatid cyst, chest-wall, mediastinal, pericardial, myocardial, fissural and pleural-space locations have been reported. The incidence of mediastinal involvement is 0.1-0.5%. Here in this paper, two cases of mediastinal hydatid cysts are reported. Both of them had anterior mediastinal hydatidosis, while one of the patients had also additional three pericardial hydatid cysts. They have undergone thoracotomy for the removal of cystic lesions. Hydatid cysts should be considered in the differential diagnosis of mediastinal cystic lesions especially in the endemic regions. Surgical removal is the treatment of choice for mediastinal hydatid cysts, and additional medical therapy may avoid recurrence.