Association between angioarchitecture and flow parameters in ruptured and unruptured arteriovenous malformation: a pilot study by 4D flow MR

The hemodynamics of cerebral AVM likely vary with lesion angioarchitecture and the rupture status, which couldn’t be reflected by morphology-based imaging. In this pilot study, 9 patients with AVM had their complicated feeding/draining patterns visualized by 4D-flow MR. AVM tend to have heterogeneous hemodynamics even with the same Spetzler-Martin grade or similar angioarchitecture. It tends to have smaller flow of the feeding artery after rupture. AVM with deep vein drainage tends to have diffused nidus and higher wall shear stress adjacent to the nidus. Higher flow of the feeding artery was associated with higher dynamic pressure and larger nidus volume.