PURPOSE: To quantitatively analyze magnitude contrast (MC) magnetic resonance (MR) angiography and gradient-echo (GRE) MR imaging for evaluation of persistent transnidal blood flow in intracranial arteriovenous malformations (AVMs) of various sizes before or after stereotaxic radiosurgery. MATERIALS AND METHODS: Thirty-three patients with AVMs underwent 42 MC MR angiographic (maximum intensity projection [MIP] and source imaging), GRE imaging with and without flow compensation, and conventional angiographic studies within 90 days of each other. RESULTS: For MIP, source, and GRE images, the sensitivities for detection of large AVMs (> 1 cm) were 95%, 100%, and 100%, respectively, and for small AVMs (< or = 1 cm) were 27%, 50%, and 67%, respectively. MC MR angiography and GRE imaging depicted all eight nidi that were completely thrombosed on conventional angiograms. CONCLUSION: GRE imaging and MC MR angiography reliably depict AVMs larger than 1 cm. GRE is more sensitive for detection of small residual nidi (< 1 cm). Source images must be evaluated to accurately assess low-flow lesions. Neither GRE nor MR angiography is reliable for detection of mean nidus diameters less than 0.36 cm.
PURPOSE: To quantitatively analyze magnitude contrast (MC) magnetic resonance (MR) angiography and gradient-echo (GRE) MR imaging for evaluation of persistent transnidal blood flow in intracranial arteriovenous malformations (AVMs) of various sizes before or after stereotaxic radiosurgery. MATERIALS AND METHODS: Thirty-three patients with AVMs underwent 42 MC MR angiographic (maximum intensity projection [MIP] and source imaging), GRE imaging with and without flow compensation, and conventional angiographic studies within 90 days of each other. RESULTS: For MIP, source, and GRE images, the sensitivities for detection of large AVMs (> 1 cm) were 95%, 100%, and 100%, respectively, and for small AVMs (< or = 1 cm) were 27%, 50%, and 67%, respectively. MC MR angiography and GRE imaging depicted all eight nidi that were completely thrombosed on conventional angiograms. CONCLUSION: GRE imaging and MC MR angiography reliably depict AVMs larger than 1 cm. GRE is more sensitive for detection of small residual nidi (< 1 cm). Source images must be evaluated to accurately assess low-flow lesions. Neither GRE nor MR angiography is reliable for detection of mean nidus diameters less than 0.36 cm.
Authors: D R Buis; J C J Bot; F Barkhof; D L Knol; F J Lagerwaard; B J Slotman; W P Vandertop; R van den Berg Journal: AJNR Am J Neuroradiol Date: 2011-11-17 Impact factor: 3.825
Authors: M Vella; M D Alexander; M C Mabray; D L Cooke; M R Amans; C M Glastonbury; H Kim; M W Wilson; D E Langston; M B Conrad; S W Hetts Journal: AJNR Am J Neuroradiol Date: 2020-05-07 Impact factor: 3.825