I would recommend checking out something called Slipping Rib Syndrome. It can be debilitating and only seen on CT if it is converted to 3D image. Check out slippingribsyndrome.org . There are also 2 very helpful Facebook groups. I finally figured it out myself, after 5 years of being told all is ok, including 2 trips to Mayo Clinic. The groups and website have a list of Drs that treat SRS. They would recommend seeing a SRS MD for a diagnosis. Hope this may be of help. Best of luck.