My 46 year old son has bony growths on each clavicle near the sternum. Nuclear scan gave diagonsis of plasmacytoma, but Incisional biopsy revealed no malignancy. Dr. who did biopsy said he removed "chunks" of bony and soft tissue during the procedure and called it osteoarthritis.. But the growths of growing again. Biopsy was about 4 weeks ago. What could this be?