My mother had a recent ct scan, it showed 3 lung nodules, 4mm 6mm & 9mm she is 77yrs has had a cva 2yrs ago, history of lymphoma, & ex smoker. cancer?

Probably not cancer: But best to talk with your doctor about the possibility of a ct guided biopsy by an interventional radiologist. A thin needle is passed into the nodule most easily reached and a sample is obtained for pathology. A biopsy is the only way to know for sure.

Low chance: Possible, but more likely benign granulomas. Follow with ct in 4 months or so. With other risks listed, operation is unlikely unless enlarging , or suspicion of lymphoma again.

Possibly cancer.: Risk depends on the total Pk/year smoking history amassed before she quit and the specifics of the lymphoma tx received ie. chemo? agent and # cycles if radiation was given, dose and location. If 9mm nodule is noncalcified then it should be followed by repeat scan in 3 mos and if it enlarges by 3mm or more biopsy is warranted. Presentation of case at a Tumor Board is probably indicated