**3.4 Coiling**

EVT emerged in the 1990's with coiling [62]. Since then, technological advances in coil properties made neuro-interventional procedures safer with improved outcomes. Recently, a single center study reported 0% of poor outcomes when coiling was used [25], however >20% of poor outcomes have been reported after coiling in aneurysms >10 mm size, with wide necks, unfavorable dome-to-neck ratio < 2 and fusiform configuration [63]. So, using coiling alone must be used just in aneurysms with specific characteristics, otherwise new devices must be considered.

#### **3.5 Stent assisted coiling**

This method represents a solution for aneurysms in which coiling alone will not be the best option (mentioned in **Figure 1**), as coiling this endovascular technique has the same concerns about patient selection, recovery and risks. However, when leaving a stent placed in the artery it is important to manage the tolerance and adherence of the patient to dual anti-platelet therapy (DAPT) (**Figure 2**)[64].
