CC BY-NC-ND 4.0 · Asian J Neurosurg 2022; 17(02): 337-341
DOI: 10.1055/s-0042-1750386
Case Report

Feasibility of Metal Artifact Reduction on CT Angiography for Planning Direct Surgery of Tentorial dAVF after Onyx Embolization

Kanji Nakagawa
1   Department of Neurosurgery, Kansai Rosai Hospital, Amagaski, Hyogo, Japan
,
Shingo Toyota
1   Department of Neurosurgery, Kansai Rosai Hospital, Amagaski, Hyogo, Japan
,
Takeshi Shimizu
1   Department of Neurosurgery, Kansai Rosai Hospital, Amagaski, Hyogo, Japan
,
Tomoaki Murakami
1   Department of Neurosurgery, Kansai Rosai Hospital, Amagaski, Hyogo, Japan
,
Takuyu Taki
1   Department of Neurosurgery, Kansai Rosai Hospital, Amagaski, Hyogo, Japan
› Author Affiliations

Abstract

Although Onyx is approved as an embolic material for arteriovenous malformation (AVM) and dural arteriovenous fistula (dAVF), metal artifacts due to Onyx on CT remain problematic. We report the feasibility of a metal artifact reduction (MAR) algorithm on CT angiography (CTA) in the planning of direct surgery of dAVF after transarterial Onyx embolization. A 45-year-old male patient presented with right pulsatile tinnitus, and cerebral angiography demonstrated right tentorial dAVF. As the dAVF had not completely disappeared even after Onyx transarterial embolization, we planned direct surgery. Evaluation of the lesion was difficult on normal preoperative CTA because of Onyx artifacts, but CTA using MAR enabled a detailed planning of direct surgery. Direct surgery was performed through right retrosigmoid craniotomy. Referencing CTA using MAR, we identified the draining veins originating from the main drainer, which were coagulated and cut, achieving complete occlusion of the dAVF. His symptoms disappeared with no postoperative complications. CT angiography using MAR was useful for planning direct surgery after Onyx embolization. As the incidence of direct surgery after transarterial Onyx embolization for AVM or dAVF is increasing, MAR on CTA will become more important.



Publication History

Article published online:
25 August 2022

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