Spontaneous Regression of an Unruptured Anterior Cerebral Artery Aneurysm after Coiling Trial

Abstract

Objective: Spontaneous occlusion of unruptured aneurysm is extremely rare. Previous reports have described spontaneous occlusion of ruptured aneurysms, giant-size aneurysms, and dissecting aneurysms. To our knowledge, there have been no reports on the spontaneous occlusion of unruptured aneurysms following an attempted endovascular procedure.

Case Presentation: A 70-year-old female patient whose unruptured aneurysm was detected by brain checkup was referred to our department. Coiling was attempted but failed due to instability of the microcatheter. Immediately after the procedure, a head MRA showed that the aneurysm remained, but follow-up MRA and 3D-CTA 6 months after the endovascular procedure demonstrated spontaneous occlusion of the aneurysm.

Conclusion: We report a spontaneous occlusion of unruptured, small cerebral aneurysm following an attempted coil embolization.