Phase-contrast MR angiography of intracranial dural arteriovenous fistulae |
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Authors: | M Cellerini M Mascalchi S Mangiafico G P Ferrito V Scardigli G Pellicanò N Quilici |
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Institution: | (1) Section for Radiodiagnosis, Department of Clinical Physiopathology, University of Florence, Viale Morgagni 85, I-50134 Florence, Italy, e-mail: m.cellerini@dfc.unifi.it, Fax: + 39-55-43 19 70, IT |
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Abstract: | MRI and phase-contrast MR angiography (PC MRA) were obtained in 13 patients with angiographically confirmed intracranial
dural arteriovenous fistulae (DAVF). Three- and two-dimensional PC MRA was obtained with low (6–20 cm/s) and high (> 40 cm/s)
velocity encoding along the three main body axes. MRI showed focal or diffuse signal abnormalities in the brain parenchyma
in six patients, dilated cortical veins in seven, venous pouches in four with type IV DAVF and enlargement of the superior
ophthalmic vein in three patients with DAVF of the cavernous sinus. However, it showed none of the fistula sites and did not
allow reliable identification of feeding arteries. 3D PC MRA enabled identification of the fistula and enlarged feeding arteries
in six cases each. Stenosis or occlusion of the dural sinuses was detected in six of eight cases on 3D PC MRA with low velocity
encoding. In six patients with type II DAVF phase reconstruction of 2D PC MRA demonstrated flow reversal in the dural sinuses
or superior ophthalmic vein.
Received: 14 May 1998 Accepted: 15 December 1998 |
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Keywords: | Intracranial dural arteriovenous fistulae Magnetic resonance angiography |
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