I have been diagnosed with a calcification below the collarbone above the 1st rib and will be seeing a Rhuemetologist. What exactly is a calcification? I had rectal cancer in 2001, stage II, lower anterior resection and 6 months chemo. My oncologist is referring me over, should I be concerned, I have discomfort in my chest in that area and have been having low blood pressure with fainting type dizziness.
Dear patient Calcification is deposition of calcium at abnormal sites where normally it is not found for example in lung. You have hot calcification below clavicle and mostly in lung apex. Since you have been treated for rectal cancer with chemotherapy damage to vascular tissue and lung alveoli might have occurred which leads to abnormal calcification.  Another possibility is calcification of subclavian artery which lies just low clavicle since you are having dizziness and fainting. You need to consult your oncologist and get I ourselves examined. All the best.