Alveolar hydatid disease is a highly malignant form of echinococcosis caused by the larvae of the cestode Echinococcus multilocularis. Alveolar hydatid disease always affects primarily to the livers, unlike cystic hydatid disease caused by E. granulosus. Occasionally, there are metastases to the lungs and brain from the primary lesions. There have been few reports on the radiological features of alveolar hydatid disease caused by E. multilocularis. In the present report, we describe the radiological features of alveolar hydatid disease of the lung caused by E. multilocularis. In the cases presented here, multiple nodules were noticed on the chest radiogram. These nodular shadows varied in size and shape. On computed tomographs, the majority of nodular shadows were lobulated and well circumscribed. Thesenodules were triangular, spherical, oval or linear in shape. We considered that multiple lobulated lesions located between two segments of the lung and showing various shapes were characteristic of pulmonary alveolar hydatid disease caused by E. multilocularis.
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