Imaging cancer of the rectum : the importance of accurate staging in treatment planning

Abstract

Colorectal cancer is the third most common cancer in men and the second most common in women worldwide. It is the third leading cause of death in both sexes. The prevalence is higher, while mortality rate is lower in developed countries. However, there has been an increasing prevalence in patients under 50 years of age, and in these cases the mortality rate is also increasing. The prognosis of rectal cancer is directly related to tumour involvement of the mesorectum and the ability to achieve complete resection with tumour-free margins. Tue ability of MRI to depict the the mesorectum and the extent of its involvment by the tumour has significantly improved treatment planning and outcomes. [excerpt]