Hi!!
!st of all I want to tell you that I am a registered CT tech...So I know a little. Nodules are not always bad...many people have them. Although with your wifes history, I can see why you would be concerned. You should consider a PET scan. Most insurances will cover the cost with a diagnosis of pulonary nodule, and I am sure that a history of breast ca would help also.
With out seeing the scan/report its hard to say. But many many peopl ehave benign nodules in the lung/adrenals. Let me know if there is anything I can do for you.
Kim