Mesenteric lengthening in colorectal surgery

What is known

• Mesenteric lengthening refers to the surgical maneuvers used to gain additional small-bowel mesenteric length so an ileal pouch reaches the anus for a tension-free anastomosis in restorative proctocolectomy/IPAA. ¹
• Techniques include mobilization, stepladder/transverse peritoneal incisions over the superior mesenteric pedicle, and selective division of vessels (ileocolic pedicle, superior mesenteric pedicle, or reliance on the right-colon marginal arcade). ²
• Adequacy is judged mainly by the pouch reaching a point relative to the pubic symphysis.

What is unknown / caveats

• No consensus on which border of the pubic symphysis defines adequate length (superior vs inferior, ~2 cm difference)
• Only ~53% of studies in the systematic review defined 'adequate' mesenteric length at all
• Quantitative lengthening data are from a cadaver study
• A uniform quantitative definition is lacking; the term is a functional/procedural concept rather than a single standardized numeric definition.

References

1. Zwakman M, Hentzen JEKR, Jonker JE, Krikke C, Lange JFM, Hofker SHS. Surgical techniques for mesenteric lengthening in ileoanal pouch surgery: a systematic review. Colorectal Dis. 2023;25:1079-1089. PMID: 36726188.

2. İsmail E, Açar Hİ, Arslan MN, Çoban İ, Cömert A, Aşlar AK, Kuzu MA. Comparison of Mesenteric Lengthening Techniques in IPAA: An Anatomic and Angiographic Study on Fresh Cadavers. Dis Colon Rectum. 2018;61:979-987. PMID: 29994960.

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