Intra-operative ultrasound in detection of liver metastases.

Intra-operative ultrasonography (IOUS) combined with palpation of the liver is significantly more accurate than either computer tomography (CT) or percutaneous ultrasonography employed pre-operatively. Accurate staging of colorectal cancer is essential for appropriate treatment strategy. There is a large impact of IOUS on tumour staging and treatment especially in patients with suspected liver lesions at pre-operative imaging.