Hi welcome to HCM I have gone thru your query regarding calcium deposits in your tailbone . Dear you have not mentioned your age which can help determine the right diagnosis and treatment . Why your doctor and Chiro could not read the MRI film because it is a field of a specialist . So advance forward to know the cause, remove and solve the problem . A hormonal disorder causes calcium from the bones to move into the blood stream . A variety of calcium buildup is harmless and may be considered a normal part of aging. However, calcification can disrupt organ function and affect blood vessels. Longstanding kidney failure and excessive intake of vitamin D, which results in excessive absorption of calcium from the intestines, can also lead to this type of calcification . According to the specialists , about 99 percent of calcium in the body is transported to teeth and bones. The remaining 1 percent is in the blood, muscles, fluid outside the cells, and other body tissues. This 1 percent can add up and cause problems over time . For your info , our faulty food habits and derailed life style also is responsible for low immunity and cause of sufferings . I would like to suggest you to modify your life style and food habits . Include essential nutrient and antioxidants in proper proportion according to a qualified dietitian and regular exercise , walk , yoga - Bhujangasan Ushtrasan ,Back beding postures ,Pranayam- Deep Breathing exercises - Inhale deep - Hold 2sec - Exhale deep- Hold 2 sec . Kapalbhati , Agnisaar , Anulom Vilom are also life giver postures to be done under a qualified trainer . A spoon of turmeric powder in a cup of hot cow s milk is good to alley pain and inflammation also Homeopathic Arnica 30 /thrice / in half cup of water/ for 2-3 days day very effective in pains . Only a doctor can determine whether your if case warrants any other . treatment. Hope this helps solve your query . Don t hesitate to get back if have any other doubt .