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FIG 2. Embolization procedure conducted under digital roadmap and fluoroscopic guidance is shown.
A and B, Anteroposterior (AP) Towne's and lateral views of left vertebral injection show an enlarged left lateral posterior choroidal artery supplying AVM nidus (arrow).
C, AP view of superselective injection into left lateral posterior choroidal artery supplying AVM is shown. Position of microcatheter tip from which ethanol embolization was performed (long arrow). Note unopacified inflow (flow reversal) from small medial branch supplying normal choroid plexus of glomus (small arrow).
D and E, AP and lateral unsubtracted views (immediately after test injection) show persistent contrast filling of small choroidal branch indicating flow arrest and contrast stain in the region of atrial choroid plexus.
F, Unsubtracted lateral view showing contrast material within dependent portion of left lateral ventricle (arrows). Contrast medium appears to outline wall of ventricle. This appearance is most likely caused by preexistent intraventricular hematoma acting as radiolucent "filling defect." Radioopaque fiber-coated coils within occluded left lateral posterior choroidal artery are visible anteriorly.
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