“…The International Subarachnoid Hemorrhage Trial (ISAT) demonstrated better outcomes for ruptured aneurysms treated with coiling vs clipping, with an absolute risk reduction of 7.4% and a 7-year survival advantage, 1 a finding supported by other studies. 2,3 However, a high percentage of aneurysmal remnants, unknown long-term stability, and potential rehemorrhage are current concerns with this technique. Incomplete treatment has been reported in 15% to 65%, and recanalization can occur in 14% to 34% of aneurysms treated, with rebleeding rates from 1.2 to 2.6%.…”