Abstract
A 58-year-old man had an egg-sized subcutaneous nodule which had developed on the right thigh 17 years previously. The nodule volume enlarged in summer but reduced in winter. We performed ultrasonography of the nodule before total resection. Histopathological examination revealed a parasitic body in the adipose tissue, which had several characteristic features of plerocercoid and granulomatous changes with infiltration of eosinophils around parasites. From these findings, a diagnosis of Sparganosis mansoni was made. The serum titer against plerocercoid, as measured by ELISA, was high in the serum 14 days after total resection, and decreased 6 months after resection. From these results, the plerocercoid was estimated to have lived in his body for 17 years.
