Journal of Korean Neurosurgical Society

The Korean Neurosurgical Society (대한신경외과학회)
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The Fate of Partially Thrombosed Intracranial Aneurysms Treated with Endovascular Intervention

  • Lee, Jeongjun (Department of Neurosurgery, Dongguk University Ilsan Hospital) ;
  • Cho, Won-Sang (Department of Neurosurgery, Seoul National University Hospital) ;
  • Yoo, Roh Eul (Department of Radiology, Seoul National University Hospital) ;
  • Yoo, Dong Hyun (Department of Radiology, Seoul National University Hospital) ;
  • Cho, Young Dae (Department of Radiology, Seoul National University Hospital) ;
  • Kang, Hyun-Seung (Department of Neurosurgery, Seoul National University Hospital) ;
  • Kim, Jeong Eun (Department of Neurosurgery, Seoul National University Hospital)
  • Received : 2020.07.06
  • Accepted : 2020.09.19
  • Published : 2021.05.01
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Abstract

Objective : The fate of partially thrombosed intracranial aneurysms (PTIAs) is not well known after endovascular treatment. The authors aimed to analyze the treatment outcomes of PTIAs. Methods : We retrospectively reviewed the medical records of 27 PTIAs treated with endovascular intervention between January 1999 and March 2018. Twenty-one aneurysms were treated with intraluminal embolization (ILE), and six were treated with parent artery occlusion (PAO) with or without bypass surgery. Radiological results, clinical outcomes and risk factors for major recurrence were assessed. Results : The initial clinical status was similar in both groups; however, the last status was better in the ILE group than in the PAO group (p=0.049). Neurological deterioration resulted from mass effect in one case and rupture in one after ILE, and mass effect in two and perforator infarction in one after PAO. Twenty cases (94.2%) in the ILE group initially achieved complete occlusion or residual neck status. However, 13 cases (61.9%) showed major recurrence, the major causes of which included coil migration or compaction. Seven cases (33.3%) ultimately achieved residual sac status after repeat treatment. In the PAO group, all initially showed complete occlusion or a residual neck, and just one case ultimately had a residual sac. Two cases showed major recurrence, the cause of which was incomplete PAO. Aneurysm wall calcification was the only significantly protective factor against major recurrence (odds ratio, 36.12; 95% confidence interval, 1.85 to 705.18; p=0.018). Conclusion : Complete PAO of PTIAs is the best option if treatment-related complications can be minimized. Simple fluoroscopy is a useful imaging modality because of the recurrence pattern.

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