Objective: to assess the clinical value of intraoperative ultrasonography (IOUS) in detecting and assessment of liver metastatic tumours in colorectal cancer patients.Methods: as tudy is aretrospective analysis of 388 patients operated on for colorectal carcinoma between 1997 and 2004. In all the patients intraoperative ultrasound was performed. The authors analyzed of sensitivity,specificity,PPV,NPV and accuracy of preand intraoperative ultrasonography in detecting and staging of colorectal metastatic lesions.Results: Intraoperative ultrasonographyshowed the highest sensitivity,specificity and accuracy in both, tumor detection (99.1, 98.5 and 98.9%, respectively) and assessment (95.4, 99.5 and 99.1%, respectively). Overall sensitivity of IOUS was significantly better in detection and staging compared with preoperative ultrasonography 91.1 and 72.2%, respectively).Conclusions: IOUS should be used as routine diagnostic modality in colorectal cancer patients with hepatic metastases or suspected metastases. Tr ansabdominal ultrasonography cannot be used as the only diagnostic tool in the evaluation of liver lesions, but may be helpful in preoperative screening. Colorectal cancers often metastasize to the liver, and thereforep re-a nd intraoperative evaluation plays asignificant role. When correctly detected and evaluated, liver lesion can be surgically treated. Resection or ablation of liver metastases can prolong survival even up to 20-40% of 5-years urvival rates (1), while overall 3-year survival in patients not un-3-year survival in patients not undergoing resection of hepatic metastases range from 0to8%(2, 3).Several modalities areavailable for diagnostic imaging of liver metastases nowadays: transabdominal ultrasonography,r outine and spiral computed tomography (CT), magnetic resonance imaging(MRI), angiography,and others, including laparoscopy and the newestm odality,p ositron emission CT using INTRODUCTION
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