How far under?: Assume your ct was of your ribs. Then "knot" to which you refer is most likely muscle spasm (if painful). The most common non-painful knot would probably be a lipoma (benign fatty tumor) but other causes exist such as abscess, tumor, swollen lymph node have your doctor explain to you what his/her thinking is about your problem, don't just settle for 1 test & a brush off, if that's what's happening.
Answered 3/26/2013
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