I also had "lesions" on my liver that were picked up by CT scan. I then had an MRI to confirm what they were. It turned out that mine are "focal nodular hyperplasias" - it was explained to me that they're basically benign tumors (so not cancer). They're slowly growing but won't spread and of course won't kill me. At some point they may cause me symptoms (they currently don't cause any symptoms that I've noticed) and at some point they may grow too large and need to be surgically removed. But for the time being, they're not causing any trouble and I barely know they're there. I'm not sure if my liver hyperplasias are related to my IBD or not. But at any rate, hopefully yours is also something benign and not bothersome.