Early ceasing of intra-aneurysmal contrast opacification during coil embolization in XXXX compared with @entity439 .

@entity715 @entity397 @entity439 @entity1756
BACKGROUND: The difference between coil-embolized @entity397 and @entity439 with respect to intra-aneurysmal @entity715 formation remains to be determined. OBJECTIVE: We examined whether there was a difference between @entity397 and unruptured coil-embolized @entity439 in the rate and timing of @entity715 formation in the aneurysmal sac and discuss the effect of @entity715 on the treatment outcome. METHODS: We evaluated 209 @entity439 with an aneurysmal dome smaller than 10 mm and a neck size less than 4 mm. Of these, 91 (43.5%) were @entity397 . We assessed intra-aneurysmal @entity715 formation by the coil-packing ratio (CPR): the percentage of coil volume occupying the aneurysmal sac. The initial CPR was defined as the CPR at which contrast influx into the sac ceased and the final CPR as that at the end of the procedure. /\CPR was calculated as the difference between initial and final CPRs. @entity439 were evaluated on follow-up angiograms. RESULTS: The initial CPR was significantly lower in @entity1756 (P < .01), and there was not a significant difference in the final CPR between @entity397 and @entity439 (P = .05). /\CPR was significantly higher in @entity1756 (P < .01). The rate of aneurysmal recanalization was significantly higher in @entity1756 (P < .05). The incidence of recanalization was high in @entity1756 with low initial CPR and /\CPR values. CONCLUSION: In @entity1756 , intra-aneurysmal @entity715 formation tends to occur in the earlier stages of coil embolization. In some cases, @entity715 formation may inhibit dense coil packing and result in recanalization.
