Table 2.

Arteriovenous malformation findings

AVM No.	Timing of delayed imaging	MR Comments*	Histopathology
A	24 h	Relative signal loss on post-infusion and difference images attributed to substantial residual ferumoxytol within lumen of vascular lesion	N/A
B	24 h	Moderate amount of uptake visualized within arteriovenous malformation wall; substantial residual intraluminal ferumoxytol	N/A
C	5 days	Moderate amount of uptake visualized within arteriovenous malformation nidus. Residual intravascular tracer is minimal.	Prominent macrophage staining seen in vascular walls. Prussian blue not informative due to long interval between ferumoxytol injection and resection.
D	5 days	Small amount of signal loss visualized that corresponds to the arteriovenous malformation vessel walls. There is some signal loss apparent in post-ferumoxytol images in normal vasculature distant from bAVM, although no signal loss is seen in sagittal sinus.	N/A