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Mass along left costal margin

This is kind of a weird case. I'm kind of worried about this lump I found along my rib in the left costal margin in the upper abdomen. It feels as if it is connected to the rib but also seems to move when I suck in my stomach and becomes more prominent when I bend over. I recently had stomach pains which have subsided for almost two weeks now but noticed the lump during this time. The lump almost feels like it is part of the rib cartilage or ab muscle right under the rib cage but it does not exist on the right side. When I flex my abdominal muscles I can not tell the lump is there and it just feels as if it is part of the muscle. The mass seems pretty solid but I am able to move half of it while the other half feels as if it is fixed to the rib. I had a stomach x-ray done while I was getting my stomach checked out to see if there was a blockage in my large intestine, if this lump was something of concern shouldn't it have shown up on the x-ray. I went to a GI specialist and she felt all along the left side of my stomach but did not seem to notice the lump along the ribs, or atleast didn't mention it. It was after this appointment with the specialist that I noticed the lump myself. She also had blood tests done which came back normal except a liver enzyme was slightly off. She recently had me have an abdominal ultra sound just in case the liver abnormality was something to be taken seriously, but I have not got the results yet. Is this lump something that I should be very worried about or should it not be much of a concern since it has not been noticed in any of the tests or examinations that I've had? Thank you.
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replied April 1st, 2010
Unfortunately, I cannot offer you a diagnosis based only upon the explanation that you have provided. If the ultrasound does not suggest a cause for this lump, then a CT scan or MRI scan can be considered to further evaluate this concern.

Sincerely/ Robert A. Wascher, MD, FACS

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