1. Introduction: The surgical resection of colorectal liver metastases is the only curative therapy for those patients (1). Because a major part of those patients become diagnosed in a technical irresectable stadium, most patients primary get a chemotherapy to reach a secondary resection (2). Especially for this group of patients an effective preoperative staging is necessary to know the exact number and location of the liver metastases. Standard imaging is abdominal CT with a contrast medium, lately it is also possible to create a 3D analysis based on vasculatory territories out of the 2D data (3) (4). Alternatively MRI imaging can be used as well, but because of its defiency in the imaging of vascular anatomy it is only partly suited for the surgical planning and resection. By now the contrast enhanced sonography has been further developed and can be used for dignity evaluation of leasions. Depending on the examiner it can provide very useful informations (5). Because of the intraoperative ultrasound is the most sensitive and specific diagnosic procedure (6), the intraoperative use of contrast medium ultrasound seems to suggest itself. As the necessary ultrasonic probes weren't avaiable until now, only a few experiences have been made yet (7).