Partition of Calibrated Tris-acryl Gelatin Microspheres in the Arterial Vasculature of Embolized Nasopharyngeal Angiofibromas and Paragangliomas

The size of the vessels occluded by TGMs and their intraor extratumoral location directly depend on the size of the injected TGMs. The vessels located inside the tumors were smaller than those located outside the tumors. A threshold for the intratumoral penetration of TGMs in the vasculature can be proposed from these data. There was no evidence of different behavior of TGMs in NAFs versus PGs.