F. Salle, A. Jaume, G. Castelluccio and E. Spagnuolo
recurrent or residual lesions after coiling [ 9 ].
The ISAT revealed that rebleeding rates are 0,3% per year greater with coil embolization. Early rebleeding (during the first 30 days after treatment) was the most frequent: 1,9% for coiling vs 0,7% for clipping. Lanzino et al. mention that rebleeding rate in the first month after coil embolization might reach 2,7% 10.
A follow up study of the patients treated in the ISAT was performed to compare the frequency and consequences of aneurysm recurrence. Retreatment was performed in 17.4% of patients after primary