FIG 4. A, Low-power magnification of large PVA particles (150–250 µm) seen in arterial vessels of a meningioma. Note the particles in a small arterial vessel and large extent of necrosis next to the embolized vessel (original magnification x60).

B, High-power view shows the irregularly shaped large PVA particles that obliterate the lumen and lead to additional thrombosis (original magnification x240).