Reports have revealed the existence of colonic cancer with chronic bowel schistosomiasis. The specie most frequently involved is Schistosoma japonicum. Few cases have, however, shown Schistosoma mansoni as the involved specie. There seems to be an association between rectal cancer and Schistosoma mansoni infestation. Despite earlier studies that refuted any association between schistosomiasis and colonic cancer, more reports are lending credence to the claim that chronic colonic schistosomiasis, especially with S. Japonicum, may induce colonic cancer and the case with are reporting also point to the fact that S. Mansoni may also be implicated. We report a case of a 35-year-old man with a rectal cancer (pT3N0M0) associated with Schistosoma mansoni. He presented with intestinal obstruction and operation revealed a cirrhotic liver with hepatic schistosomiasis.