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MR imaging of symptomatic peripheral vascular malformations
1Department of Radiology, Fitzsimons Army Medical Center, Aurora, CO 80045-5001.
AJR. American Journal of Roentgenology
|July 1, 1992
Summary
Magnetic resonance (MR) imaging effectively differentiates slow-flow venous malformations from high-flow arteriovenous malformations and fistulas using T2-weighted images. Specific signal characteristics and imaging features aid in this crucial distinction for peripheral vascular malformations.
Area of Science:
- Radiology
- Medical Imaging
- Vascular Medicine
Background:
- Peripheral vascular malformations (PVMs) encompass a range of vascular anomalies.
- Distinguishing between slow-flow venous malformations (VMs) and high-flow arteriovenous malformations (AVMs) and arteriovenous fistulas (AVFs) is critical for appropriate management.
- Magnetic resonance (MR) imaging is a key modality for evaluating PVMs.
Purpose of the Study:
- To evaluate the utility of MR imaging in differentiating slow-flow VMs from high-flow AVMs and AVFs in the periphery.
- To identify specific MR imaging features that aid in the differential diagnosis of PVMs.
Main Methods:
- Retrospective review of 27 MR examinations in 25 patients with symptomatic PVMs outside the central nervous system.
- Correlation of MR findings with angiography results.
- Analysis of T1- and T2-weighted MR images for signal characteristics and anatomical features.
Main Results:
- T2-weighted MR images distinguished VMs (high signal intensity) from AVMs/AVFs (flow voids).
- VMs exhibited multifocal involvement (37%), longitudinal orientation (78%), and adherence to neurovascular bundles (64%).
- Both VMs and AVMs/AVFs showed associated muscle atrophy and subcutaneous fatty prominence.
Conclusions:
- Spin-echo MR imaging, particularly T2-weighted sequences, can reliably differentiate slow-flow VMs from high-flow AVMs and AVFs.
- Characteristic MR imaging features, including signal intensity and anatomical patterns, are valuable in the differential diagnosis of peripheral vascular malformations.