Extended Hemihepatectomies.

The extended right hemihepatectomy (also called right trisectionectomy) includes resection of segments 4-8. For cholangiocarcinoma of the liver hilum (Klatskin's tumor) or carcinoma of the gallbladder, an en-bloc resection including segments 1 and 9 is usually performed. This procedure should only be performed if the remnant liver (segments 2 and 3) provides sufficient liver function. Therefore, preoperative assessment of liver function, a volumetric assessment of the expected remnant liver volume, and exclusion of liver fibrosis or cirrhosis are essential before extended resections. [ABSTRACT FROM AUTHOR]