and Purpose-The authors report their experience using Matrix coils in the treatment of cerebral aneurysms. Methods-The outcomes of 72 consecutive patients (76 aneurysms) who underwent coiling using Matrix coils at our institution were retrospectively analyzed. Results-Seventy-four aneurysms in 70 patients were coiled using Matrix coils (ranging 3% to 100% by coil length; mean 68.8%). Two patients underwent regular platinum coil embolization after failed Matrix coil placement. Thirty-two (42%)

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... ptured aneurysms were acutely treated. In 46 aneurysms, Matrix composed Ͼ50% of coil length. Complete aneurysm occlusion was obtained in 13 aneurysms (17.6%), neck remnant in 30 (40.5%), and dome filling in 31 (41.9%). Procedural morbidity and mortality rates were 1.4% and 1.4%, respectively. Angiographic follow-up was obtained in 63.5% (47 of 74 aneurysms; average 12.2 months; range 0 to 34). In these 47 angiographically followed aneurysms, the overall recanalization rate was 57.4%. In aneurysms with Ͼ50% Matrix coils, 76.1% had angiographic follow-up (35 of 46), and in this group, the overall recanalization rate was 54.3% (19 of 35): 25% (1 of 4) for very small (Ͻ5 mm); 33% (4 of 12) for small-size (Ͻ10 mm)/small-neck (Ͻ4 mm); and 63% (5 of 8) for small-size/wide-neck (Ն4 mm). A total of 82% (9 of 11) recanalization occurred in large aneurysms (Ն10 to 25 mm). Ten aneurysms (21.3%; 10 of 47) underwent retreatment. Clinical follow-up was obtained in 61 (86%) patients (average 15 months; range 1 to 37): 87% of patients were Glasgow Outcome Scale 4 or 5. Conclusion-The use of Matrix coils resulted in worse recanalization rates than that reported for Guglielmi detachable bare platinum coils.