Tumors on the chest-wall could be benign as well as malignant and only a biopsy can confirm what it is.
Generally speaking if a biopsy has confirmed that a tumor on the chest-wall is malignant (meaning cancer) this could be located on many sites that could involve the muscles, bones, cartilage, blood vessels, connective tissue, nerves, fatty tissue, and skin of the chest.
The swollen lymph nodes could be indicative of a benign condition like infection of inflammation somewhere in the body,or due to malignancy if a biopsied mass is found to be cancerous.
You would need to discuss this with your physicians,so that this finding can be put in better context for you.
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