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European Radiology
Published in: European Radiology 1/2017

01-01-2017 | Magnetic Resonance

Time-resolved magnetic resonance angiography (MRA) at 3.0 Tesla for evaluation of hemodynamic characteristics of vascular malformations: description of distinct subgroups

Authors: Simone Hammer, Wibke Uller, Florentine Manger, Claudia Fellner, Florian Zeman, Walter A. Wohlgemuth

Published in: European Radiology | Issue 1/2017

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Abstract

Objectives

Quantitative evaluation of hemodynamic characteristics of arteriovenous and venous malformations using time-resolved magnetic resonance angiography (MRA) at 3.0 Tesla.

Methods

Time-resolved MRA with interleaved stochastic trajectories (TWIST) at 3.0 Tesla was studied in 83 consecutive patients with venous malformations (VM) and arteriovenous malformations (AVM). Enhancement characteristics were calculated as percentage increase of signal intensity above baseline over time. Maximum percentage signal intensity increase (signalmax), time intervals between onset of arterial enhancement and lesion enhancement (tonset), and time intervals between beginning of lesion enhancement and maximum percentage of lesion enhancement (tmax) were analyzed.

Results

All AVMs showed a high-flow hemodynamic pattern. Two significantly different (p < 0.001) types of venous malformations emerged: VMs with arteriovenous fistulas (AVF) (median signalmax 737 %, IQR [interquartile range] = 511 – 1182 %; median tonset 5 s, IQR = 5 – 10 s; median tmax 35 s, IQR = 26 – 40 s) and without AVFs (median signalmax 284 %, IQR = 177–432 %; median tonset 23 s, IQR = 15 – 30 s; median tmax 60 s, IQR = 55 – 75 s).

Conclusions

Quantitative evaluation of time-resolved MRA at 3.0 Tesla provides hemodynamic characterization of vascular malformations. VMs can be subclassified into two hemodynamic subgroups due to presence or absence of AVFs.

Key points

• Time-resolved MRA at 3.0 Tesla provides quantitative hemodynamic characterization of vascular malformations.
• Malformations significantly differ in time courses of enhancement and signal intensity increase.
• AVMs show a distinctive high-flow hemodynamic pattern.
• Two significantly different types of VMs emerged: VMs with and without AVFs.
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Metadata
Title
Time-resolved magnetic resonance angiography (MRA) at 3.0 Tesla for evaluation of hemodynamic characteristics of vascular malformations: description of distinct subgroups
Authors
Simone Hammer
Wibke Uller
Florentine Manger
Claudia Fellner
Florian Zeman
Walter A. Wohlgemuth
Publication date
01-01-2017
Publisher
Springer Berlin Heidelberg
Published in
European Radiology / Issue 1/2017
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI
https://doi.org/10.1007/s00330-016-4270-1

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