Abstract
Purpose
Para-aortic lymph node (PAN) metastasis for gastric cancer is considered a distant lymph node metastasis. Meanwhile, multidisciplinary treatments have improved survival of patients with PAN metastases. We developed a novel technique of curative para-aortic lymph node dissection via infra-mesocolonic approach in laparoscopic gastrectomy (CAVING approach). This method minimizes the mobilization of the pancreas and the spleen and maximizes the view from the caudal side resembling cave exploration.
Methods
After laparoscopic gastrectomy, PAN dissection is performed using the same ports setup. The retroperitoneum is widely exposed to ease anatomical cognition and for troubleshooting. The inferior vena cava, the left gonadal vein, the left renal vein, and the aorta are recognized under Gerota’s fascia. The retroperitoneum is then divided into four sections. We perform PAN dissection in the order of 16blat, 16b1int, 16a2lat, and then 16a2int. Using the CAVING approach, the caudal side of the root of the superior mesenteric artery can then be dissected below the pancreas, and only the cranial side of the SMA root requires a suprapancreatic approach.
Results
In three cases, preoperative chemotherapy and laparoscopic gastrectomy plus D2 with PAN dissection were performed for gastric cancer and esophagogastric junction cancer. The median operation totaled 484 min, 142 min for the PAN dissection. The median whole blood loss was 130 ml. The median harvested number of PAN was 25.
Conclusions
The minimal mobilization of pancreas and the wide surgical fields by CAVING approach may facilitate safe and reliable PAN dissection.
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Abbreviations
- PAN:
-
para-aortic lymph node
- SMA:
-
superior mesenteric artery
- IMV:
-
inferior mesenteric vein
- IMA:
-
inferior mesenteric artery
- IVC:
-
inferior vena cava
- POD:
-
postoperative day
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Contributions
Study conception and design: Keiji Hayata, Toshiyasu Ojima, Masaki Nakamura, and Hiroki Yamaue. Acquisition of data: Keiji Hayata, Junya Kitadani, and Akihiro Takeuchi. Analysis and interpretation of data: Keiji Hayata, Junya Kitadani, and Akihiro Takeuchi. Drafting of manuscript: Keiji Hayata, Toshiyasu Ojima, and Hiroki Yamaue. Critical revision of manuscript: Keiji Hayata, Toshiyasu Ojima, and Hiroki Yamaue.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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The present retrospective study was approved by the Institutional Review Board of the Wakayama Medical University Hospital, with a waiver of the written informed consent from all patients concerned.
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Video
After gastrectomy, the transverse colon is lifted to the cranial side. The duodenum is mobilized above layer of retroperitoneum, the Gerota’s fascia, and the IVC is revealed. The dorsal side of mesocolon including the IMV is dissected above the retroperitoneal layer until identification of the left gonadal vein and the left renal vein. The retroperitoneal space is fully exposed. The retroperitoneum is divided into four sections by the cross of the aorta and the left renal vein.
Part 1 of PAN dissection is at the No.16b1lat station. To identify the left gonadal vein, the retroperitoneum is dissected laterally from the root of the IMA. The caudal lymphatic ducts in level of the IMA root are also clipped to prevent lymphatic leakage. On the dorsal side of the left gonadal vein, there is a dissectible layer between 16b1lat and perinephric fat tissue. The dissection in the medial side is performed along the aorta. The left renal artery is exposed on the cranial side.
Part 2 of PAN dissection is at the No.16b1int station. A Nathanson retractor is hooked onto the mesocolon and the body of the pancreas to secure the surgical field. On the lateral side, the retroperitoneum is longitudinally divided to expose the adventitia of the IVC. The dissection in the medial side is performed along the aorta. The caudal lymphatic ducts in level of the IMA root are also clipped to prevent lymphatic leakage. The anterior longitudinal ligament is exposed on the dorsal side. On the cranial side, the right renal artery is exposed.
Part 3 of PAN dissection is at the No.16a2lat station. In this case, the left adrenal vein was dissected with clipping because left adrenal metastasis was suspected. The cranial side of the left renal artery dissected. Next, the surgical field is changed to a suprapancreatic view and the splenic artery is taped. The body of pancreas is mobilized by caudally retracting the taping of splenic artery. When the retropancreatic fascia is divided, the retroperitoneal space dissected from the caudal side is opened. The dissection line of the medial side is the lateral side of the inferior phrenic artery, celiac ganglion, superior mesenteric artery, and aorta.
Part 4 of PAN dissection is at the No.16a2int station. The approach is again shifted to the infra-mesocolon view. The cranial side of the right renal artery is dissected. After placing a gauze over the surface of the right renal artery and the left renal vein, the surgical field is changed to a suprapancreatic view. The dissection line of medial side is celiac ganglion, and the crus of diaphragm with resection of the greater and lesser splanchnic nerve. The dissection line of lateral side is the surface of left adrenal vein under the IVC.
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Hayata, K., Ojima, T., Nakamura, M. et al. Curative para-Aortic lymph node dissection Via INfra-mesocolonic approach in laparoscopic Gastrectomy (CAVING approach). Langenbecks Arch Surg 406, 2067–2074 (2021). https://doi.org/10.1007/s00423-021-02198-6
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DOI: https://doi.org/10.1007/s00423-021-02198-6