My wife found a lump on her left breast which got checked and was done US on the 9th of September. 18mm lump found, they did core biopsy but both sonographer and nurse told it didn't look too worrying (checked also lymph nodes which looked clear at US). After 2 weeks we got called back and we spoke to the surgeon - my wife has a papillary lesion with some cells that are suggestive of pre-invasive breast cancer. We've been told they needed to do more checks on the sample but anyway they will need to take the lump out regardless. Then she went for another US of both breasts where right breast looked fine and left breast was hard to see due to a hematoma because of the biopsy, plus a mammogram and a 3d mammogram. We heard back today and they told us that they couldn't tell anything more from the biopsy, however they'd like to do a MRI since both US and Mammogram weren't extremely clear (my wife is 38 and has very dense breast). We're going for another US in 2 days for some small lumps she has found after diagnosis (doctor mentioned could be lipomas/cysts/lymphnodes but better to do a US) and then we will be called for a MRI in 7-10 days.

What I'm trying to understand is that for them to say it's pre-invasive, could we expect a bad outcome from the MRI as in it's something more widespread?

Appreciate we need to wait for the exams but it's a lot and while we're taking it lightheartedly (both doctor and US staff said we caught it quite early!) I don't know what to expect. Any previous experience sharing would be highly appreciated. Thanks a lot everybody.