Summary: Portcatheter in intraarterial chemotherapy of primary and metastatic hepatic tumors. 23 patients with primary or metastatic liver tumors had implanted a portcatheter into the hepatic artery and received repeated continuous intraarterial infusions of fluorinated pyrimidins. From the technical point of view we have followed the merit of portcatheters in comparison with routinely used Seldinger catheters. The average function time of portcatheter is up to date 4.5 months. The therapy is complicated predominantly by oclusions of probable thrombotic origin, which often result in a failure of catheter function. Compared with Seldinger catheter reveals the portcatheter in continuous intraarterial infusion certain clinical and economic advantages, especially the possibility of care on a domiciliary basis. These advantages will be more widely utilized if portcatheter is available during surgical operations and especially if catheter function is prolonged. This seems to be a case of portcatheter s qualified use and consistent maintenance.