Left temporal lobe arteriovenous malformation (AVM)

AVM-T2-T1-POSTMRAMIP-4927559-2.375x3.jpg

Image 1

Clinical History: 
A 31 year old woman

Diagnosis:
Left temporal lobe arteriovenous malformation (AVM)

MR Technique: 
T2 FSE and post-contrast T1 GRE 2D images at the level of the left frontal horn are presented. Imaging parameters for the T2-weighted scan were TR/TE = 6000/91, 4 mm slice thickness, acquisition of 17 echoes, use of a parallel imaging factor of 2, in plane resolution of 0.7×0.7 mm2, and an image acquisition time of 01:18. Imaging parameters for the T1-weighted scan were TR/TE = 250/2.46, 4 mm slice thickness, 2 scan averages, in plane resolution of 0.9×0.9 mm2 and an image acquisition time of 01:52. The time of flight MRA was acquired as 3 slabs, each with a scan time of 01:45, using TR/TE = 22/3.68 and a tip angle of 18 degrees, with voxel dimensions of .7x.7x.5. Scans were acquired at 3 T, on a Siemens Tim Trio system.

Imaging Findings:
Abnormal flow voids are noted adjacent to the sylvian fissure, in the temporal lobe, on the left on the T2 weighted scan. There is abnormal enhancement of both the nidus and a large draining vein on the post-contrast T1-weighted scan. The time of flight MRA more clearly depicts the enlarged left middle cerebral artery feeding this AVM. On the MRA multiple enlarged left MCA branches are also visualized, together with the nidus and a large draining vein directed posteriorly, which emptied into the left transverse sinus.