AIM: to evaluate the strength properties of the colorectal tumors in patients with colorectal cancer with acute bowel obstruction. MATERIALS AND METHODS: twenty-six resected specimens with colorectal cancer complicated by acute bowel obstruction were studied using histological and immunohistochemical methods. Following criteria have been assessed: tumor histological structure and differentiation, invasion depth, bowel wall thickness in central and peripheral tumor parts, ratio of necrosis, proper tumor tissue and preserved muscular and serosal layers. RESULTS: in tumors of 3.9-5.5 cm long no significant differences were detected between volume ratio of the preserved muscle tissue, fibrous tissue and necrotic tissue in central part of tumors compared with peripheral one. In tumor >5.5 cm long the volume ratio of proper tumor and necrotic tissue was significantly higher in tumor central part compared to peripheral one. CONCLUSION: endoscopic stenting in colorectal cancer with acute bowel obstruction is more safety if tumor length ≤5.5 cm. The tumor perforation is highly likely when tumor length >5.5 cm