Liver ultrasound: A key procedure in the surgeon's toolbox.

Intraoperative liver ultrasound (US) is an imperative adjunctive procedure during any liver surgical procedure. Intraoperative US can be used to confirm preoperative findings, to identify new findings, and to guide the conduct of the procedure. A major barrier to incorporation of US into the surgeon's toolbox is training and education. A standardized training program for surgical fellows has been developed based on the mastery learning framework.