Objective: The purpose of this study was to analyze the characteristics of partially thrombosed intracranial aneurysms (PTIAs) in terms of location, shape, size, and symptoms, and to assess outcome according to the type of treatment.
Methods: We reviewed the radiological and clinical findings of 35 cases of PTIAs followed in our institution between 2006 and 2011. We divided all treatment modalities into two groups. Patients in group A (n = 15) were treated by blood flow blockage from the lesion of the pathogenic segment of the parent where the PTIAs originated, and patients in group B (n = 20) were only treated with obliteration of the remnant perfused aneurysmal sac. Radiological and clinical outcomes of treatment were compared between the two groups.
Results: Group A showed complete occlusion in 15 cases (100 %) compared to six cases (30.0 %) in group B (p < 0.001). No cases required retreatment in group A, while six cases (30.0 %) underwent retreatment in group B (p = 0.027). In terms of clinical outcome, 12 cases (80.0 %) showed symptomatic improvement in group A compared to eight cases (40.0 %) in group B (p = 0.037). Nine cases (60.0 %) showed improvement in postoperative GOS at six months compared to initial preoperative GOS in group A versus four (20.0 %) in group B (p = 0.032).
Conclusion: PTIAs should be treated by preventing blood flow from the lesion of the pathogenic segment of the parent artery where PTIAs originate. This treatment approach is associated with better clinical and radiological outcomes.
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