FIG 5. A, Small PVA particles (45–150 µm) are found in arterial vessel, in which they nearly completely obliterate the lumen, as well as in vessels in which they do not fully obliterate the lumen but lead to intravascular thrombosis (original magnification x60).

B, High-power view of small PVA particles in a precapillary vessel, with thrombosis surrounding the irregularly shaped PVA particle. A slight lymphocytic inflammatory reaction surrounds the vessel (original magnification x480).