Structural limitations of currently available microcatheters and coils for endovascular coiling of very small aneurysms

Abstract
Coil embolization for very small aneurysms (<3 mm in maximum diameter) has been considered a technically challenging method due to increased risk of potential aneurysm perforation during the procedure. We present our observations about the structural limitations of eight types of microcatheters and three types of detachable coils, and technical pitfalls in the coiling of very small aneurysms.