A CASE OF RECTAL CANCER IN ASSOCIATION WITH OVA OF SCHISTOSOMIASIS JAPONICUM

Abstract

A 65-year-old man who lived in endemic schistosomal area underwent low anterior resection for rectal cancer at our hospital, and many calcified ova of schistosomiasis j aponicum were observed in the colonic wall mainly in the submucosal layer which was demonstrated by histopathological findings of resected specimen. The tumor was diagnosed as T3, N0, M0, Stage II A. On the other hand, since calcified lesions 12 mm in size were observed in the intrahepatic portal vein by computed tomography before operation, we suspected the lesion may indicate schistosomiasis ova and administered praziquantel at 40 mg/kg for 2 days after operation. Five months after operation, there was yellowish submucosal lesion in the lower rectum shown by colonoscopic examination and biopsy specimen revealed calcified ova. However, calcified lesions in the intrahepatic portal vein disappeared on computed tomography.