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[A case of paragonimiasis westermani with a worm migration track on chest CT].

A 59-year-old man with rusty-colored sputum was admitted for evaluation of a nodular shadow on his chest radiograph. Chest computed tomography (CT) revealed nodules and nodular opacities with a cavity in the right S3. Chest CT also showed clearly a double linear shadow other than the bronchovascular bundle, with a different course from that of the bronchovascular bundle, suggesting a worm migration track. The diagnosis of paragonimiasis westermani was confirmed by detection of Paragonimus eggs in a bronchoscopic aspirate smear and by immunoserological examination. The linear lesion on the chest CT is uncommon in paragonimiasis, but the finding is thought to be useful for the diagnosis of this disease.