Fig. 2.

Intraoperative situation during a segment 4 partially preserving hilar en bloc resection with a focus on principles of the resection line, the division of the left hepatic duct, and the reconstruction by hepaticojejunostomy. a,b Illustration of the resection line after parenchymal transection: the cranial parenchymal resection starts in Cantlie’s line before it turns to the left, perpendicularly between the left medial and the left lateral section, resulting in a partial resection of segment 4