-Report on Experiments and Clinical Cases-

Left Posterior Approach Pancreaticoduodenectomy with Total Mesopancreas Excision and Circumferential Lymphadenectomy Around the Superior Mesenteric Artery for Pancreatic Head Carcinoma

Takayuki Aimoto¹, Satoshi Mizutani², Youichi Kawano¹, Akira Matsushita¹, Naoyuki Yamashita³, Hideyuki Suzuki² and Eiji Uchida¹

¹Department of Surgery, Nippon Medical School
²Institute of Gastroenterology, Nippon Medical School Musashi Kosugi Hospital
³Tsuboi Hospital

Background: In most cases of pancreatic head cancer, surgery often results in noncurative resection, which is frequently related to inadequate clearance of the mesopancreas.
Purpose: The aim of this report is to introduce the surgical technique of left posterior approach pancreaticoduodenectomy (PD) with total mesopancreas excision and circumferential lymphadenectomy around the superior mesenteric artery (SMA) (LPA-PD) and to examine whether this procedure increases the rate of true curative resection and decreases the rate of locoregional recurrence.
Patients and Methods: Nineteen patients underwent standard PD, and 19 patients underwent LPA-PD. The demographic characteristics, intraoperative outcomes (mean operative time and mean blood loss), postoperative outcomes (complications, type of recurrence and survival), and pathological findings (R number, number of removed regional lymph nodes and positive resection margins) were evaluated.
Results: The patient characteristics did not differ significantly between the groups. The mean blood loss in the LPA-PD group was significantly less than that in the standard PD group (p<0.05). The incidence rate of postoperative complications did not differ between the groups. No surgery-related deaths occurred in either group. The number of removed regional lymph nodes around the superior mesenteric artery in the LPA-PD group was significantly greater than that in the standard PD group (p<0.01). The R0 resection rate in the LPA-PD group was higher, although not significantly so, than that in the standard PD group. The resection margin of the mesopancreas was negative in all patients of the LPA-PD group. The rate of locoregional recurrence in the LPA-PD group was significantly lower than that in the standard PD group (p<0.01). The postoperative survival rate did not differ significantly between the groups.
Conclusion: Our method of LPA-PD helps secure the negative margin of the mesopancreas and enables complete circumferential lymphadenectomy around the SMA. Therefore, LPA-PD may increase the true curative resection rate and decrease the locoregional recurrence rate compared with standard PD.

J Nippon Med Sch 2013; 80: 438-445

Keywords
mesopancreas, pancreaticoduodenectomy, curative resection, left posterior approach

Correspondence to
Takayuki Aimoto, MD, Department of Surgery, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo 113-8603, Japan
aimoto@nms.ac.jp

Received, August 13, 2013
Accepted, August 20, 2013