Yes, unfortunately it can recompress. A number of things can happen, depending on what the surgeon did and didn't do, and your specific case. In my case, scar tissue formed around the artery, so I had the same pattern of compression on ultrasound as shown prior to surgery. When I was operated on a 2nd time, the surgeon also found a mass of neural tissue compressing the celiac trunk, which she removed, and divided the ligament an additional 2 cm apart. My first surgeon probably just didn't do enough. Overall I am doing better after this 2nd surgery but I worry constantly about it coming back with every twinge of pain.

Another issue that I have heard about is the artery can fail after years of compression, which would require a stent or bypass. Others on this forum can tell you more about that.