Effect of rectal stump washout on the presence of free malignant cells in the rectum during anterior resection for rectal cancer

Free malignant cells are shed into the rectal stump during anterior resection. Mechanical lavage with saline effectively eradicates these cells; however, the completeness of cleansing is volume related. Incomplete cleansing with 500 ml of saline correlates with lower tumors. Technically more difficult surgery involves traumatic handling of the tumor and possibly induces shedding of more malignant cells. We suggest that rectal stump washout during anterior resection for carcinoma should be routine, and the volume of the lavage fluid should be larger than 500 ml.