Impact of tumor proximity to vessel on conversion in laparoscopic liver resection: A retrospective cohort study.

BACKGROUND

Although various difficulty scoring systems have been proposed for laparoscopic liver resection (LLR), details remain uncertain regarding distance between the tumor and vessels as a factor of difficulty. We aimed to examine the risk factors for conversion to open hepatectomy in LLR, including distance between tumor and vessels.

METHODS

Between January 2012 and December 2022, 118 patients who underwent LLR were retrospectively enrolled and their perioperative characteristics were evaluated.

RESULTS

A total of 10 cases (8.5%) were converted to open hepatectomy during LLR. The conversion group had lower platelet count, shorter distance between the tumor and a medium vessel (defined as diameter of 5-10 mm), and greater tumor depth compared with the pure LLR group. Receiver-operating characteristic curve analysis identified 10 mm as the optimal cutoff value of tumor proximity to a medium vessel (sensitivity, 80.0%, specificity, 78.7%, AUC 0.817) for predicting conversion. In multivariate analysis, lower platelet count (p = .028) and tumor proximity within 10 mm to a medium vessel (p = .001) were independent risk factors for conversion in LLR.

CONCLUSIONS

Our study suggests tumor proximity within 10 mm to a medium vessel and lower platelet count as predictors of unfavorable intraoperative conversion in LLR.