Investigation of Brain Arteriovenous Malformations

Diagnostic Imaging

Digital subtraction angiography (DSA) with 2D, 3D, and reformatted cross-sectional views is the investigation of choice for brain arteriovenous malformations, as recommended by the American College of Radiology, due to its superior spatial and temporal resolution 1, 2, 3
High-frame-rate planar 2D-DSA (≥7.5 frames per second) distinguishes the precise order of vessel filling even in high-flow situations, which is crucial for treatment planning 2, 4
Volumetric 3D-DSA and time-resolved 4D-DSA provide structural and combined structural/temporal information that can be reformatted in cross-sectional views to precisely localize the AVM relative to surrounding anatomical structures, as per the guidelines from the Journal of Neurointerventional Surgery 2, 4
Vessel-selective catheter-based DSA enables precise identification of individual arterial inputs to the brain AVM, which is essential for treatment planning, according to the American College of Radiology 2, 4

DSA remains superior to non-invasive modalities for detecting high-risk features that predict rupture and guide treatment, including feeding artery aneurysms and intranidal aneurysms that significantly increase hemorrhage risk, as stated by the Journal of Neurointerventional Surgery 2, 5, 6
Large-caliber arteriovenous fistulous connections within the nidus can be identified using DSA, which is critical for treatment planning, as recommended by the American College of Radiology 2, 5
Venous outflow stenoses that elevate rupture risk can be detected using DSA, which is essential for treatment planning, according to the Journal of Neurointerventional Surgery 2, 5
Deep venous drainage patterns associated with higher hemorrhage risk can be identified using DSA and MRI, as stated by the Journal of the American College of Radiology 6, 3

MRI offers the greatest soft tissue anatomical resolution and is essential for identifying eloquent cortex and planning surgical approaches, as recommended by the Journal of Neurointerventional Surgery 2, 4
Fusion between 3D-DSA and 3D-volumetric MRI represents the optimal combined technique for localizing AVMs and stratifying both natural history risk and treatment risk, according to the American College of Radiology 2, 4
Functional MRI assists in mapping eloquent brain regions that may have shifted location due to the nearby AVM, which is critical for treatment planning, as stated by the Journal of Neurointerventional Surgery 2, 4

Initial detection may occur with CT (for hemorrhage) or MRI (for incidental findings), but DSA is mandatory before any treatment decision, as recommended by the Journal of Neurointerventional Surgery 1, 2, 7
Four-vessel DSA with 2D, 3D, and 4D sequences is necessary for definitive pre-treatment assessment, including selective injections of all potential feeding vessels, according to the American College of Radiology 1, 2
Fusion imaging of 3D-DSA with volumetric MRI is essential for optimal treatment planning, as stated by the Journal of Neurointerventional Surgery 2, 4