EP35 7 T MR imaging of small incidental unruptured intracranial aneurysms: first year of clinical experience

up after WEB implantation compared to gold standard DSA. Methods A total of 42 aneurysms treated with WEB were included. Two experienced readers analysed the anonymised postprocedural MRI, with TOF sequences with an without gadolinium, and DSA images independently, using the WEB Occlusion Score (WOS). Results From our data we found corresponding WOS results from MRI compared to DSA in 60.53% of the cases. With DSA as reference MRI revealed false positive results in 23.7%, and false negative results in 15.8% of the cases. Interrater agreement was 90.48%. The MRI sensitivity was 84.2%, the specificity 76.32%. Conclusions From this data WEB follow up with MRI alone bears a high risk of false findings and cannot replace DSA for a precise WOS assessment.