May 1st comes, I go to my appt, Dr says he feels something there and orders chest x ray, x ray of ribs, basic blood work and a cat scan of my abdomen without contrast. Their is NO Pain but this numbness does extend into my back. Examples of soft tissue mass in this area is lipoma, a benign tumor from fat cells that is mobile, sliding like, soft to firm and is usually painless. This could be a sign of a ruptured aortic aneurysm, which is an emergency condition. Respond to patient questions and discuss challenging presentations with other members. I would be happy to receive news and updates from Cancer Chat. Kidney cancer can sometimes cause a mass in the abdomen. Anatomical landmarks, front view Digestive system Fibroid tumors Aortic aneurysm. Linda J. McRib - Sun Nov 30, 8: Swelling in this part can be of soft tissue or bone origin. Bone swellings are hard and fixed not mobile. Right-upper quadrant Left-upper quadrant Right-lower quadrant Left-lower quadrant Other terms used to find the location of abdominal pain or masses include: I called ever morning trying to get in sooner but had no luck. I don't know what to do.