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Venogram shows what?
I’ve shared your pictures as you posted them with a group of my hernia colleagues.
Here is my take: this is probably your abdominal wall and/or omentum. If you have iliac vein obstruction, the blood flow needs to get to your liver somehow, and eventually back to your heart, so the veins communicating this back to your heart (abdominal wall, omentum, intestines) will be prominent.
This is most likely not related to your mesh at all. And your pain is also most likely not from the mesh.