During anterior resection for rectal cancer at 12 cm from the anal verge, the surgeon performs total mesorectal excision (TME). What is the MOST important surgical plane in TME that determines local recurrence rates?
- A The plane between the mesorectum and the presacral fascia (Waldeyer's fascia)
- B Ligation of the inferior mesenteric artery at its origin to clear level III nodes
- C The sharp dissection within the visceral fascia envelope completely investing the mesorectum without breaching it ✓
- D Preservation of the levator ani muscle insertions to achieve adequate distal clearance
Explanation
The oncological principle of TME, as described by Heald, is to dissect in the avascular embryological areolar plane between the visceral fascia envelope (holy plane) completely investing the mesorectum and the parietal fascia without breaching the mesorectal fascia. Maintaining an intact mesorectal envelope removes the entire mesorectal fat pad with all its lymphovascular tissue as a complete specimen, which reduces local recurrence from >25% to <5-8%. Breach of the mesorectal fascia (plane 1 or 'intramesorectal dissection') leads to the highest local recurrence rates. Waldeyer's fascia fusion anteriorly requires careful anterior dissection to avoid entering the plane behind the prostate/vagina.
Reference: Bailey & Love's Short Practice of Surgery, 27th ed.
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Written and medically reviewed by the StethoPrep medical team.