Can a lipoma be non visible in my abdomen, or another benign tumor?

Thank you for your question.A Lipoma can certainly be invisible when it is situated in the soft tissues of the abdomen. I would have preferred an MRI to delineate the soft tissues better. The CT Scan, however, will be able to show what you have. If indeed, it is a Lipoma, it can be removed without problems. All The Best !

A CT Scan is the appropriate next step, and should help to differentiate this mass from some of the other possibilities.Lipomas are typically soft and non-tender so your description of a painful mass is already atypical.  In view of your medical history, it is best if you are assessed in person (as you are doing) by, presumably, a board-certified plastic surgeon and/or general surgeon.  Once the non-invasive diagnostic tests have been completed you'll be in a better position to make a decision as to what should be done next.I hope that this helps and good luck,Dr. Alan EnglerMember of #RealSelf100@RealSelf