In the total mesorectal excision (TME) technique for rectal cancer, which fascial plane must be maintained to achieve an oncologically adequate resection with minimal autonomic nerve damage?

• A Within the mesorectal fat, deliberately entering the mesorectal envelope
• B Between the peritoneum and the mesorectal fascia anteriorly
• C Directly on the rectal wall to minimize blood loss
• D Between the visceral fascia propria and the parietal presacral fascia (Waldeyer's fascia) ✓

Explanation

TME requires sharp dissection in the anatomical plane between the visceral fascia propria of the mesorectum and the parietal presacral (Waldeyer's) fascia posterolaterally. This plane preserves the hypogastric nerve plexus and pelvic autonomic nerves while achieving an intact mesorectal envelope. Entering within the mesorectal fat leaves residual disease and violates the oncological principle. Anteriorly, the plane is between the mesorectal fascia and Denonvilliers' fascia. Bill Heald's description of this 'holy plane' reduced local recurrence from ~25% to <10%.

Reference: Bailey & Love's Short Practice of Surgery, 27th ed.

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Written and medically reviewed by the StethoPrep medical team.