Patient : A couple months ago I was at the gym doing spinning. When I stood up to run on the bike I felt a crack,pop on the upper left of my back, parallel to my ribs. When this happen it hurt to breath, to move my chest, and to sit straight or bend. I ignored the pain, but now i feel discomfort and pressure on my rib below my left breast. I started to massage it and i felt a little lump. You can't see the lump but you can feel it if you press on it. What can this be?
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