PMC3596147_01
(A) Angiography of the right iliac artery shows an aneurysm of the right internal iliac artery (arrow). (B) Angiography performed after coil embolization shows disappearance of the aneurysm. (C) CT scan performed 1 month after from coil embolization shows dense coil packing from common iliac artery to aneurysmal neck (arrow). (D) CT scan performed 1 year after from coil embolization shows change of the coil shape (arrow), suggesting coil compaction. (E) Time-resolved MRA shows enhancement inside the aneurysm in the arterial phase (arrow), suggesting recanalization. (F) Repeat angiography shows enhancement inside the aneurysm, similar to the findings in time-resolved MRA (arrow).
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Aneurysm was located at the bifurcation of the right IIA and therefore, after forming a femorofemoral bypass, the distal part of the right IIA, aneurysm and the common iliac artery were embolized with a coil (Figure 1A, 1B). One year later, a coil compaction was suspected on CT scan images (Figure 1C, 1D) and the size of the aneurysm seemed to be increased. Thus, time-resolved MRA was performed and it showed minute vascular flow inside the aneurysm (Figure 1E). Angiography was performed and blood flow inside the aneurysm was visualized, similar to the findings in time-resolved MRA (Figure 1F).
PMC3596147_02
(A) Celiac artery angiography shows a splenic artery aneurysm (arrow). (B) Angiography performed after coil embolization shows disappearance of the aneurysm. (C) CT scan performed on the next day after coil embolization shows densely-packed coils inside the splenic artery aneurysm (arrow). (D) CT scan performed 4 years after coil embolization shows coil compaction (arrow). (E) Time-resolved MRA shows enhancement inside the aneurysm in the arterial phase (arrow) and recanalization is suspected. (F) Repeat angiography shows complete recanalization of the aneurysm, similar to the findings in time-resolved MR angiography (arrow).
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A 36-year-old male patient with splenic artery aneurysm underwent coil packing with preservation of splenic artery patency (Figure 2A, 2B). Four years later, a coil compaction was suspected in CT scan imaging (Figure 2C, 2D), but CT evaluation of recanalization was not possible because of severe metal artifacts. It showed complete recanalization of the aneurysm (Figure 2E). Angiography was subsequently performed, showing recanalization of the aneurysm as did the time-resolved MRA (Figure 2F).