Abstract
A 44-year-old man consulted our clinic because of cough with bloody sputum. Chest X-ray and computed tomography revealed a nodular shadow in the left lingular lobe. On suspicion of lung cancer, he underwent bronchoscopic examination. The transbronchial biopsy demonstrated several parasite eggs surrounded by granulomatous tissue. Bronchial lavage also revealed an egg. The dot-ELISA test yielded positive results for IgG antibody against both Paragonimus westermani and Paragonimus miyazakii antigens. A diagnosis of infection by P.westemanii was made because the test showed stronger reaction against the antigen of this parasite than against P.miyazakii antigen. Detailed history taking failed to disclose the route of infection. The treatment with praziquantel was considered effective because of roentgenological improvement and decrease in the titer of the specivic antibody.
