Fig. 2

Patient in whom a Silk (nitinol device) and a Surpass Streamline (cobalt chromium device) flow diverter was placed symmetrically for unruptured dissecting V4 segment aneurysms. The native DSA image shows both devices (a). The subtracted DSA image from the right b and left c vertebral angiograms shows no evidence of a residual aneurysm or neointimal proliferation with significant stenosis on either side. d MIP reconstruction (11 mm thick) of noncontrast MRA suggests an absence of in-stent stenosis on the right and preocclusive stenosis on the left. e MPR reconstruction (11 mm thick) of the same image is consistent with a patent right V4 segment, whereas the left V4 segment appears occluded. f Note the size of the susceptibility artifact on the left side harboring the cobalt chromium device compared to that on the right side harboring the nitinol device