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Residual aneurysm three months after treatment with single flow diverter (FD) (a), which was re-treated with a second FD (b), with persistent failure to occlude the aneurysm (c). Pathological analysis (d) showed bare areas of FD mesh (arrow) with partially organised intra-aneurysmal thrombus. Biopsy of the neointima over the device showed endothelialisation (arrow in e) (haematoxylin, phloxine and saffron stain, original magnification × 400).
