Transanal Decompression Tube Versus Stent for Acute Malignant Left-sided Colonic and Rectal Obstruction

Inclusion Criteria:

1. definite diagnosis of left-side colonic or rectal obstruction;
2. symptomatic colonic obstruction for less than 1 week;
3. colonic obstruction caused by a histologically proven malignant colonic tumor

Exclusion Criteria:

1. suspected benign colonic or rectal obstruction;
2. right-side colonic obstruction;
3. patients with signs of peritonitis;
4. dysfunction of blood coagulation, active bleeding, active infection, and significant cardiac or pulmonary disease;
5. patients who do not want to undergo surgery.