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Reappraisal of the lateral rectal ligament: an anatomical study of total mesorectal excision with autonomic nerve preservation

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Abstract

Purpose

The term “lateral rectal ligament” in surgery for rectal cancer has caused confusion regarding its true existence and contents. In previous studies, investigators claimed the existence of the ligament and described its topographical features as neurovascular structures and their surrounding connective tissues located at the anterolateral aspect of the distal rectum or the posterolateral aspect of the middle rectum. The purpose of this study is to evaluate the structure of the so-called “lateral rectal ligament” in cadaver dissections.

Methods

Dissection was performed in nine cadavers (eight males and one female, aged 73 to 94 years) in accordance with typical total mesorectal excision techniques. During dissection, structures related to “the ligament” were examined and images recorded.

Results

At the anterolateral aspect of the distal rectum, the middle rectal artery was noted to be crossing the fusion of Denonvilliers’ fascia and the proper rectal fascia. At the posterolateral aspect of the middle rectum, there was a structure which consisted of the rectal nerves running through the fusion of the pelvic fasciae. Although called “ligaments,” neither structure contained discrete strong connective tissue fixing the rectum to the pelvic wall.

Conclusions

The proper rectal fascia and surrounding pelvic fasciae fuse firmly anterolaterally and posterolaterally where neurovascular structures course toward the rectum. During a total mesorectal excision, the surgical dissection plane coincides with the fused part of the fasciae, which had long been considered the “lateral rectal ligament.”

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Author information

MI made substantial contributions to conception and design, acquisition, and analysis and interpretation of data. AS contributed to analysis and interpretation of data and assisted in the preparation of the manuscript. All other authors have contributed to data interpretation and critically reviewed the manuscript. All authors gave final approval of the version to be submitted.

Correspondence to Masayuki Ishii.

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Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in this study were in accordance with the ethical standards of the Jichi Medical University Institutional Review Board and with the 1964 Helsinki declaration and its later amendments.

Informed consent

Informed consent for cadaver donation was obtained from every family of the cadaver.

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Ishii, M., Shimizu, A., Lefor, A.K. et al. Reappraisal of the lateral rectal ligament: an anatomical study of total mesorectal excision with autonomic nerve preservation. Int J Colorectal Dis 33, 763–769 (2018) doi:10.1007/s00384-018-3010-1

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Keywords

  • Lateral rectal ligament
  • Total mesorectal excision
  • Autonomic nerve preservation
  • Pelvic anatomy