Fig. 2From: Early postoperative decrease of skeletal muscle mass predicts recurrence and poor survival after surgical resection for perihilar cholangiocarcinomaEvaluation of skeletal muscle mass volume. Axial computed tomography image of the abdomen at the third lumbar vertebra. The skeletal muscle area is highlighted in hatching (Hounsfield unit threshold from − 29 to + 150)Back to article page