Figure 6.

The advantage of depicting partial embolized nidus and draining veins on silent MRA. Images of right temporal lobe BAVM after partial embolization in a 15-year-old male patient. (A) Silent MRA visualized the nidus (thick arrow) and the draining veins (arrowheads). The image quality scores are as follows: feeding artery: 3; nidus: 3; and draining vein: 3. (B) The nidus (thick arrow) was faintly seen on TOF MRA, while the two veins draining downward were not visualized. The image quality scores are as follows: feeding artery: 3; nidus: 2; and draining vein: 0. (C) Lateral view of the right internal carotid artery angiography showed the nidus (thick arrow) with partial embolization draining forward down into the cavernous sinus and back down into the straight sinus (arrowheads). MRA, magnetic resonance angiography; TOF MRA, time-of-flight MRA.