R. Michardiere et al., Comparison of MRA and angiography in the follow-tip of intracranial aneurysms treated with GDC. Report of 25 correlations, J NEURORAD, 28(2), 2001, pp. 75-83
Objective: Evaluation of TOF 3D MRA compared to angiography in the follow-z
ip of intracranial aneurysms treated by Guglielmi detachable coils (GDC).
Material and method: Prospective analysis of follow-up MRA and angiographie
s for 20 patients with 22 aneurysms. There were 2 MRAs for 3 aneurysms givi
ng a total of 25 cases.
Results: A poor correlation between MRA and angiography was observed in 21
cases of 25. For 9 cases, stable exclusion (95-100%) visible on MRA was con
firmed by angiography. For 12 other cases, a residual flow within the aneur
ysmal neck or a residual flow between coils was detected by MRA and confirm
ed by angiography. A poor correlation was found in 4 cases out of 25: 3 res
idual flows within the aneurysmal neck and I residual flow within the coil
mass not visible on MRA. MRA has a sensibility of 75% for the detection of
an anomaly, a specificity of 100%, a positive predictive value of 100% and
a negative predictive value of 69.2%. MRA is able to detect a large residua
l flow within aneurysmal neck and a re-growth, wich would need a second emb
olization. Anomalies not visible on MRA as observed in our study, residual
flow within the coil mass and the aneurysmal neck, do not require complemen
tary treatment.
Conclusion: A normal TOF 3D MRA can avoid an angiography in the follow-zip
of an intracranial aneurysm treated by GDC.