A case of colon adenoma associated with Schistosomiasis japonica

Abstract

Colonoscopy in an 81-year-old man undergoing dialysis treatment identified a 20 mm laterally spreading tumor (LST) in the transverse colon, and endoscopic submucosal dissection (ESD) was performed. The tumor was pathologically diagnosed as a tubular adenoma. Parasite eggs were present in the submucosal layer and the case was diagnosed as schistosomiasis japonica. Several theories exist regarding the association between schistosomiasis japonica and colorectal cancer, but no consensus has been reached. Schistosoma japonica ova were present beneath the colon adenoma. This case report is presented with a literature review, with regard to future follow-up and the possibility of carcinogenesis.