Breaching the mesorectum.
D006801:Humans; D008643:Mesentery; D009364:Neoplasm Recurrence, Local / Q000517:prevention & control; D010534:Peritoneal Neoplasms / Q000473:pathology*; D011379:Prognosis; D012004:Rectal Neoplasms / Q000473:pathology*; D009626:Terminology as Topic