The purpose of this book is to assess the efficacy of the Nellix endoprosthesis in the treatment of patients with AAA, underlining the characteristics, the modalities of implantation, all the possible indications according to the IFUs suggested by the manufacturer and outside the same, the limits related to the implant and the monitoring procedures during the follow-up of the treated patients. Only long-term results will allow a complete and definitive assessment on the real possibilities of use of Nellix, but the data collected from the current experiences of the single centers and those of the trials are very encouraging and promising for an adequate and safe use of this endoprosthesis in the treatment fo aortic aneurismal disease.