Some edges are not smoothing in Blender I imported this geometry from Zbrush. As you can see the other edges around this area were smooth-able, but I could not get the edges connected to this cone shaped ridge to smooth. The first image is a screen grab of the geometry edges. The second image shows what the geometry looks like. I tried everything that normally works to get them to smooth. Clear Sharp. Shading Smooth. Recalculate Normals. But they are not smoothing. What could cause this?
In the end I retopologised the model and it was much cleaner. It was for the best because the result had half the number of polygons. Thanks for the input.

To add more information the topology now looks like this. While it doesn't flow like it used to, it smooths nicely and that is what's important for this.