My partner (27 years old) was diagnosed with triple-negative breast cancer in April this year, with a T2 tumor and 1 lymph node involvement. The onc requested a CT scan, which showed multiple very small nodules on her lungs (less than 3mm). He said lots of people in the city we live in have them and it doesn't necessarily mean it's mets, but they wanted to keep an eye on them and do a follow-up scan in 3 months. They were classed as indeterminate in the meantime.

Since then, she's had 9 weeks of chemo (3 rounds), and a few weeks ago she had a follow-up MRI and CT scan. We were very nervous about the CT scan but hoping it would show that it wasn't lung mets.

When the onc called to give us the results, he said the MRI scan showed a 1.5cm reduction in the breast tumor (around 35% reduction), which he was happy with. He then said the CT scan showed a slight reduction in the lung nodules, but that "we're not convinced it's cancer". He said they're still indeterminate and they'll do another follow-up scan in 6-7 months (following her op) to check again. He also said he thinks the next result will still be indeterminate, and they'll then schedule one for 12 months after that. When we pushed to see if he thinks they're probably not cancer, he said "I want to be more grey than that" and said one oncologist who read the results was more concerned, but in the interdisciplinary meeting they were less concerned.

Initially, we were relieved, as "we're not convinced it cancer" sounded like a positive outcome. But now I'm driving myself crazy wondering what the chances are that it won't turn out to be lung mets in future scans. We obviously want to stay hopeful, but we're worried that the fact that they'd shrunk at all means the chances that they'll turn out to be benign are slim. 

I'm wondering if anyone here has been in a similar situation and had a positive outcome (i.e. indeterminate lung nodules detected, follow-up scan showed a slight reduction, but it eventually found out that their nodules were benign?).