The paper describes the technique of anatomical liver segmentectomies based on the extraparenchymal clamping, at the hepatic hilum, of the afferent vascular pedicles. The resection is started on the liver surface along the demarcation line caused by the ischemia. During parenchymal transection the technique of hemihepatic vascular occlusion has been undertaken. The results obtained with 125 segmentary hepatic resections performed for hepatocellular carcinoma arised on cirrhosis are also reported. The overall operative mortality has been 6.4%. The actuarial 1 and 3 year survivals were 93.3% and 70.4% respectively. Hepatic segmentary resections are recommended for limited hepatic lesions, mainly in well compensated cirrhotic patients.