Cancer with unknown primary tumor. Enlarged lymphnodes under armpits. Tumor find in breastbone. Ok ct Scan of lungs, abdomen, breast. Lymphoma?

Need biopsy done. A biopsy of one of the axillary lymph nodes may provide some guidance about the primary source of this tumor. It could be breast Cancer which sometimes would not show on a Mammogram(it is called an Occult Primary). Without obtaining tissue for microscopic exam it is difficult to proceed further. Ask his oncologist to provide you some answers and an understanding of this problem.