Mediastinal hydatid disease: report of three cases.

We report three patients who had mediastinal echinococcosis and then review the literature. The first patient had a primary anterior mediastinal echinococcal cyst, the second a mediastinal hydatid cyst, secondarily involving the mediastinum and mimicking Hodgkin's disease, and the third had a primary cardiac and pericardial hydatid cyst. In two patients computed tomography (CT) was helpful in making a preoperative diagnosis before any complication could arise. In the third CT was not done and the diagnosis of cardiac echinococcosis at surgery was a surprise. Two large echinococcal cysts compressing the ventricles, which on echography and cardioangiography had the appearance of endomyocardial fibrosis, were removed by total excision. The disease in each patient was correlated with clinical and radiologic findings and was confirmed by tissue microscopy.