Background: Systemically administrated cationic lipid complexes accumulate selectively in angiogenic tumor endothelium. The chemotherapeutic agent paclitaxel was encapsulated into these lipid complexes, providing an anti-neovascular targeting agent (MBT-0206). In the current study the effect of MBT-0206 on the tumor vasculature was investigated by dynamic magnetic resonance tomography (dMRT). Material and methods: On day 5, 6 and 7 after subcutaneous inoculation of A-MEL-3 tumor cells into Syrian golden hamsters, the animals were treated by i.v. injection of MBT-0206 followed by dMRT measurements at day 8. Untreated tumors were analyzed as a control. The intratumoral blood volume (BV) and the permeability-surface area product within the tumor were calculated from MRI data using a tracer kinetic model. Results: The treatment with MBT-0206 resulted in a significant inhibition of tumor growth compared to the control group. The intratumoral BV of MBT-0206 treated animals was significantly reduced by 34% compared to untreated controls. In addition, the permeability-surface area product in the MBT-0206 treated tumors was increased. Immunohistochemical analysis revealed a significant reduction of the microvascular density in the MBT-0206 treated tumors by 60%. Conclusion: The anti-vascular tumor therapy with MBT-0206 resulted in a functional impairment of the tumor vasculature. dMRT represents an useful approach to quantify the anti-vascular treatment effects, thus providing an attractive surrogate measure of the therapeutic effectiveness of MBT-0206 in clinical trials.