New, bony lump on collarbone, near sternum

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Anyone have anything like this, a hard roundish lump, maybe 2cm., just under clavicle, next to sternum. Xray made no mention, just said no fractures. Seems like a bone spur, but weird place to get one, they usually develop in joints, and wouldn't a spur show on xray? It's on my cancer side. Radiation effect? Not moveable, no pain. Any ideas?

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