Distal pancreatectomy with partial preservation of the spleen: a new surgical technique
Executive Summary
Spleen-preserving distal pancreatectomy is the standard of care for resecting benign or low-grade malignant tumors in the pancreatic body and tail. Traditionally, surgeons have relied on two primary methods: the Kimura technique (preserving splenic vessels) and the Warshaw technique (sacrificing splenic vessels while relying on collateral circulation). However, both methods face significant limitations, including high operational difficulty or the risk of splenic necrosis and regional portal hypertension.
This briefing document outlines a novel surgical approach: distal pancreatectomy with partial preservation of the spleen. This technique targets the preservation of the superior pole of the spleen by maintaining the short gastric blood vessels, even when the main splenic artery and vein must be sacrificed. Clinical data from initial technical reports demonstrate that this method provides a viable alternative to total splenectomy when conventional techniques fail. The procedure maintains splenic immune function, prevents common postoperative complications, and supports compensatory growth of the residual splenic tissue.
Analysis of Conventional Surgical Techniques
Historically, the management of lesions in the pancreatic body and tail has involved two primary spleen-preserving methodologies. Each presents specific challenges that may necessitate a transition to total splenectomy.
The Kimura Technique
Mechanism: Entails the meticulous separation of the splenic vessels from the pancreas to conserve both the splenic artery and vein.
Advantages: Minimizes the risk of postoperative splenic necrosis.
Limitations: High operational difficulty; potential for vessel injury often forces a transition to the Warshaw technique or total splenectomy.
The Warshaw Technique
Mechanism: Simultaneous dissection of the splenic artery and vein. Splenic viability relies on collateral circulation via the short gastric, left gastroepiploic, and posterior gastric arteries.
Advantages: Less technically challenging than the Kimura technique.
Limitations: Significant compromise of the total blood supply. High risk of splenic ischemia, necrosis, and regional portal hypertension, particularly in patients with splenomegaly.
The Novel Approach: Partial Spleen Preservation
The proposed technique introduces a third option when both Kimura and Warshaw procedures are unfeasible due to tumor proximity to the splenic hilum or severe congestion following vessel dissection.
Anatomical Foundation
The technique is based on the robust collateral circulation between the stomach and the spleen. Crucially, the short gastric blood vessels provide sufficient supply to the superior pole of the spleen. Research indicates that preserving as little as 5–10% of the spleen is sufficient to maintain its immune function. Furthermore, the residual spleen typically undergoes compensatory growth within the first postoperative year.
Surgical Highlights and Innovations
Strategic Resection: Instead of attempting to save the entire organ under poor circulatory conditions, the middle and inferior poles (most susceptible to ischemia) are resected.
Superior Pole Focus: By preserving the superior pole and its associated short gastric vessels, surgeons can ensure a stable blood supply.
Alternative to Total Splenectomy: This technique may end the necessity for total splenectomy in cases of benign or low-grade tumors where traditional vessel preservation fails.
Clinical Case Reports and Outcomes
The viability of partial spleen preservation is supported by two distinct clinical applications involving complex pancreatic lesions.
Table 1: Clinical Case Summaries
Postoperative Observations
In both cases, enhanced CT scans confirmed robust blood supply and significant venous backflow in the residual superior pole. No splenic necrosis was observed, and patients successfully avoided the long-term antiplatelet therapy typically required after a total splenectomy.
Standardized Surgical Procedure
The procedure is applicable in both open and laparoscopic settings, provided the surgical team has experience in distal pancreatectomy and partial splenectomy.
Exploration and Exposure: Resect the gastrocolic ligament while strictly preserving the gastrosplenic ligament and short gastric vessels.
Vessel Assessment: Attempt to isolate the splenic artery and vein. If the tumor is inseparable from these vessels (preventing Kimura) or if ligation results in severe ischemia (complicating Warshaw), proceed to partial preservation.
Pancreatic Dissection: Excision of the pancreas 1–2 cm from the tumor margin.
Splenic Management:
Identify the demarcation between sufficient and obstructed blood flow.
Resect the middle and inferior poles 1 cm below the ischemia border.
Conserve the superior pole supplied by the short gastric vessels.
Hemostasis: Apply monopolar electrocoagulation (80 W) to the splenic section and cover with absorbable hemostatic materials.
Verification: Monitor the residual spleen for 10–15 min to ensure the restoration of normal coloration. ICG fluorescence can be used for intraoperative blood supply assessment.
Pathology: Conduct a rapid frozen pathology test. If high-grade malignancy is found, the approach must pivot to radical surgery (total splenectomy).
Clinical Considerations and Guidelines
Indications
Benign or low-grade malignant tumors of the pancreatic body and tail.
Inability to separate the tumor from the splenic hilum or vessels.
Failure of the Kimura or Warshaw techniques due to poor circulation or vascular damage.
Postoperative Care
Bed Rest: 48–72 hours to minimize the risk of splenic wound bleeding.
Monitoring: Continuous blood pressure and pulse monitoring; regular tracking of platelet variations.
Imaging: Postoperative enhanced CT to confirm residual splenic blood flow and rule out necrosis.
Conclusions and Future Outlook
This novel technique represents a significant advancement in organ-preserving surgery. By shifting the focus from "all-or-nothing" spleen preservation to a targeted partial approach, surgeons can higher success rates in maintaining splenic function. While current clinical results are positive, large multicenter studies are required to establish this as a globally recognized standard in distal pancreatectomy.
