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CC BY-NC-ND 4.0 · Asian J Neurosurg 2020; 15(04): 889-898
DOI: 10.4103/ajns.AJNS_374_20
Original Article

Getting more out of follow-up three-dimensional time-of-flight magnetic resonance angiography in endovascularly treated intracranial aneurysms

Rajendra Phadke
1   Department of Radiodiagnosis and Interventional Radiology, Apollomedics Superspeciality Hospitals
2   Department of (former Prof. and Head), Department of Radiodiagnosis, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow
,
Vivek Singh
3   Department of Radiodiagnosis, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow
,
Madan Balaguruswamy
4   Department of (former Neuroradiology fellow) Department of Radiodiagnosis, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow
5   Department of Interventional Radiology, Royal Care Super Speciality Hospital, Coimbatore
,
Alok Udiya
4   Department of (former Neuroradiology fellow) Department of Radiodiagnosis, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow
6   Department of Interventional Radiology, CHL Hospital, Indore
,
Gurucharan Shetty
4   Department of (former Neuroradiology fellow) Department of Radiodiagnosis, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow
7   Department of Radiology, Fortis Hospital and Cancer Institute, Bengaluru, Karnataka
,
Surya Prasad
3   Department of Radiodiagnosis, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow
,
Somit Mittal
4   Department of (former Neuroradiology fellow) Department of Radiodiagnosis, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow
8   Mittal Diagnostic Centre, Aligarh
,
Gaurav Chauhan
4   Department of (former Neuroradiology fellow) Department of Radiodiagnosis, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow
,
Vedita Dhull
4   Department of (former Neuroradiology fellow) Department of Radiodiagnosis, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow
,
Zafar Neyaz
3   Department of Radiodiagnosis, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow
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Background: We retrospectively re-evaluated follow-up three-dimensional (3D) time-of-flight (TOF) magnetic resonance angiography (MRA) in patients with aneurysms treated with coiling at our Institute. Aims: To document the type and frequency of postcoiling residue patterns as seen on follow-up MRA and to document their evolution with time where a further follow-up MRA was available. To assess the implications of the location of the aneurysm on residue and recurrence. Subjects and Methods: 3D TOF MRA for 104 aneurysms were evaluated for residue size and residue pattern. Mainly, three residue patterns were identified. The aneurysms were allocated to different groups depending on the location. Multiple MRA studies were available in subgroup 1* and subgroup 2* where the residue growth or reduction and pattern change was noted and residue growth rates were calculated. Results: Collectively 54 (51.92%) aneurysms showed occlusion (pattern 1 and 1A), 31 (29.81%) showed neck residue (pattern 2A, 2B and 2C) and 19 (18.27%) showed recurrence (pattern 3A, 3B and 3C, residue size >3 mm) at the last follow-up MRA. Type 2A/3A patterns were more common. In terms of residue and recurrence, the distally located aneurysms (Group 3) appeared to do well. For those showing growing residue/recurrence, the average growth rate was calculated at 0.094 mm/month and 0.15 mm/month, respectively, for subgroup 1* and subgroup 2*, although the difference was not statistically significant. With longer follow-up the persisting and growing residues from both the subgroups, not warranting early re-treatment, showed a low growth rate at approximately 0.05 mm/month. Conclusions: TOF MRA helps in identifying different residue patterns in coiled aneurysms. Serial follow-up MRA appears useful in showing the pattern and size changes in the residual aneurysm. Although more work is required in this regard, calculation of aneurysm/residue growth rate may be useful in prognostication and in scheduling further follow-up or retreatment. The risk factor related to the location of the aneurysm warrants further study.

Key-words:

Aneurysm - endovascular treatment - magnetic resonance angiography - recurrence

Financial support and sponsorship

Nil.




Publication History

Received: 30 July 2020

Accepted: 03 September 2020

Article published online:
16 August 2022

© 2020. Asian Congress of Neurological Surgeons. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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