Schistosoma japonicum Associated With Colorectal Cancer.

Colorectal cancer (CRC) is one of the most common cancers worldwide, with increasing prevalence in Asian countries with a crude incidence of 21.1 per 100,000. Schistosoma is a genus of trematodes that infect millions of humans, affecting multiple organs, notably the intestines, liver, and bladder. Those trematodes may cause chronic inflammation in the affected organ leading to long-term complications such as fibrosis and neoplasia. There is rising evidence that infection with Schistosoma japonicum is correlated with the liver and CRC in endemic Asian countries. It is reported that chronic infection with Schistosomiasis raises the risk of CRC by 3 times. Less commonly seen outside of endemic areas, we present a case of S. japonicum-associated CRC in the United States in a woman with sigmoid adenocarcinoma and Schistosoma japonicum infection.