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Web Occlusion Scale (WOS).
| A | Complete occlusion |
| B | Complete occlusion. Visible collection of contrast within the marker recess |
| C | Residual neck filling. Contrast opacification of the aneurysm neck extending beyond the marker recess |
| D | Residual aneurysm filling. Contrast beyond the aneurysm neck and into the fundus. Either deep to the proximal recess or around the periphery of the device. |
