<s>[INST] The results of a CT scan of my aorta came back with non specific lymph node enlargement; my aorta was fine. I have had a mastectomy on the right side close to 18 years ago with no further evidence of cancer. I’ve also had 2 knee replacements within 2 years due to severe arthritis. Otherwise I am a relatively healthy woman of 64 years old. I have been doing a little reading about enlarged lymph nodes and am not terribly alarmed, but of course the thought of breast cancer on the left side has crossed my mind. I guess I would just like a few logical reasons why my lymph nodes might be enlarged other than cancer. [/INST] Hi,I would advise you to see an oncologist.Enlarged lymph nodes can be with or without cancer.Its better to do a PET scan for re-assurance.The PET scan would give you the value of activity happening in the lymph node (cancerous lymph node lights up more on PET scan).I think PET would be good for reassurance.I hope it helps.Regards. </s>