Surgical Approaches for Rectal Cancer

Anatomical Considerations for Surgical Decision-Making

The National Comprehensive Cancer Network recommends low anterior resection as the treatment of choice for lesions in the mid to upper rectum 1
For lesions in the lower rectum, abdominoperineal resection or coloanal anastomosis is typically required, according to the National Comprehensive Cancer Network 1
Low anterior resection is appropriate for tumors located in the rectosigmoid junction, as these are in the upper portion of the rectum, as stated by the National Comprehensive Cancer Network and the British Journal of Cancer 1, 2
Tumors within 8 cm of the anal verge but limited to 30% of the rectal circumference may be candidates for transanal excision rather than low anterior resection, as per the National Comprehensive Cancer Network 1

The British Journal of Cancer recommends that to obtain satisfactory tumor clearance, the safe margin between the lower end of the tumor and the rectal stump must be greater than or equal to 2 cm 2
A minimum of 6-8 lymph nodes should be examined for proper staging, according to the British Journal of Cancer 2
For tumors of the lower third of the rectum, or the middle third but palpable by digital examination, excision of the entire mesorectum reduces the risk of locoregional recurrence, as stated by the British Journal of Cancer 2
Cancer distal to the dentate line would require abdominoperineal resection as sphincter preservation is not possible, according to the British Journal of Cancer 2