I had colon resection 8 months ago, same reason.... several weeks ago a six inch area around my abdominal incision area became hard, pronounced and uncomfortable. I thought it was due to constipation from a medication I was taking. I, too, had CT scans and no hernia was indicated. I'm trying to lose 5 lbs (5'8" 145 lbs) to see if it will go away. I'm following your thread to see if someone can shed light on this. Sorry I couldn't help.