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Keywords:
Vascular, MR-Angiography, MR, Embolisation
Authors:
N. K. Majewska, A. Kociemba, M. Pyda, M. Wykretowicz, M. Stajgis, K. Katulska; Poznan/PL
DOI:
10.1594/ecr2016/C-2297
Aims and objectives
There are multiple classifications for vascular abnormalities.
The newest is “ISSVA classification for vascular anomalies” (Table 1) which is based on the founding biological investigation of Mulliken and Glowacki published in 1982.
More simply,
malformations can be categorized as either low-flow or high-flow lesions on the basis of their hemodynamic flow characteristics.
The distinction between low- and high-flow lesions is crucial because it determines appropriate patient treatment,
namely sclerotherapy for low-flow lesions or embolization for high-flow lesions.
Dynamic time-resolved MR angiography has been proven to be an accurate method for distinguishing between high- and low-flow vascular malformations.
However,
there are several ways of identifying vascular malformations as either high flow or low flow.
Some methods are based only on the determination of the time interval between the start of arterial enhancement and the onset of lesion enhancement (artery–lesion time),
whereas other methods suggest that the time of maximum enhancement of the lesion is crucial.
In addition,
most authors have used other findings based on T1- and T2-weighted imaging (signal intensity,
signal voids) to support the angiographic outcomes.
The aim of our study was to examine the ability to distinguish high- from low-flow lesions on the basis of the enhancement pattern on maximum intensity projection (MIP) images acquired from dynamic time-resolved MR angiography sequences and compare it with previously described methods.