Abstract
Background
Although lateral pelvic lymph node dissection (LLND) might be an effective approach for patients with rectal cancer with lateral lymph node metastasis, it is technically challenging because of the anatomical complexity and location of the deep pelvis. An assistance by transanal approach might be useful for a successful LLND.
Methods
From September 2016 to May 2021, 39 patients with low rectal cancer underwent transanal total mesorectal excision with LLND. Among them, 18 patients underwent LLND using a conventional laparoscopic approach alone, while the remaining 21 underwent LLND using both conventional and transanal approaches. Their clinical outcomes were retrospectively compared.
Results
The operation time for LLND on each side was significantly shorter in the transanal group (105 min vs. 54 min, P < 0.001). The intraoperative blood loss was also significantly less in the transanal group (40 g vs. 0 g, P = 0.031). The rate of overall postoperative complications ≥ grade II according to the Clavien–Dindo classification was significantly less in the transanal group (66.7% vs. 28.6%, odds ratio: 5.000, 95% confidence intervals: 1.313–19.047, P = 0.040). The number of harvested lateral lymph nodes in both groups was similar (8.5 vs. 8, P = 0.544).
Conclusion
The transanal approach for LLND reduced operative time, blood loss, and morbidity compared with the conventional approach alone in a cohort of patients with rectal cancer.
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Takeru Matsuda, Ryuichiro Sawada, Hiroshi Hasegawa, Kimihiro Yamashita, Masako Utsumi, Hitoshi Harada, Naoki Urakawa, Hironobu Goto, Shingo Kanaji, Taro Oshikiri, and Yoshihiro Kakeji have no conflicts of interest or financial ties to disclose.
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Supplementary file1 (WMV 46349 kb) The lateral pelvic space was entered from the anal side by separating the S4 splanchnic nerve from the levator ani muscle, encountering fatty tissues around the distal branches of the internal iliac vessels, such as the inferior vesical vessels. These fatty tissues were dissected from the vesicohypogastric fascia.
Supplementary file2 (WMV 34974 kb) The fatty tissues, including the obturator compartment, were separated from the levator ani and internal obturator muscles. The obturator nerve was preserved.
Supplementary file3 (WMV 39302 kb) The fatty tissues were dissected from the bottom plane, including the sciatic nerve, coccygeal muscle, and internal pudendal artery. LLND was completed by dissecting these fatty tissues from the obturator nerve and umbilical artery.
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Matsuda, T., Sawada, R., Hasegawa, H. et al. Transanally assisted lateral pelvic lymph node dissection for rectal cancer. Surg Endosc 37, 1562–1568 (2023). https://doi.org/10.1007/s00464-022-09617-9
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DOI: https://doi.org/10.1007/s00464-022-09617-9