Anatomical Resection VS. Nonanatomical Resection for Colorectal Liver Metastases With Gene Mutation or Right-sidedness

Based upon the segmental anatomy of the liver according to Couinaud system, anatomical resection (AR) was defined as resection of 1 or more complete hepatic segments in our study, including bisegmentectomy, right hemihepatectomy, left hemihepatectomy, extended right hemihepatectomy, extended left hemihepatectomy, single segmentectomy, caudate lobectomy, or a combination of these.

Nonanatomical resection(NAR), known as wedge resection, was defined as resection of the tumor with a margin of normal parenchyma without regard to hepatic anatomy.