Pulsations: Those pulsations if synchronous with your heart beat or pulse may be the aorta which is the largest artery in your body and runs through your torso and up against the spine. If the pulsation are very prominent, I recommend that you be evaluated by a physician for high blood pressure and a thoracic aneurysm but I wouldn't be surprised if no serious problems are present at your age.
Answered 4/8/2018
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