A CASE OF HUMAN PULMONARY CANINE FILARIASIS SUSPECTED AS A PULMONARY METASTASIS OF RECTAL CARCINOMA

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  • 直腸癌肺転移との鑑別が困難であったヒト肺犬糸状虫症の１例

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Human pulmonary canine filariasis is a rare disease in which embolization of infected larvae in the peripheral pulmonary artery occurs forming a granulomatous lesion. We report a case, first suspected as a pulmonary metastasis of rectal carcinoma that turned out to be a case of human pulmonary canine filariasis after resection. The patient was a 65-year-old male who had positive occult blood in stool and an abnormal shadow in a chest x-ray in the routine check-up, and was referred to our hospital in Aug. 2005. After a thorough examination diagnosis of rectal carcinoma with pulmonary metastasis was made and lower anterior resection of the rectum and partial pulmonary resection were performed in Sept. of the same year. Pathological diagnosis of the rectal tumor was well differentiated adenocarcinoma but the pulmonary nodule was a fibrous granulomatous tissue with some necrosis and filarial worms in it. Accordingly a diagnosis of pulmonary canine filariasis was made rather than the metastasis of the rectal carcinoma.

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