Golly Gosh, @Teabaglady - that sounds most unusual, I would think!! I've only been on the blog since Jan 2018 - but never heard of that happening - TWICE!
If they got it all in the biopsy - it would have been tiny as those needles aren't 'huge' - so unlikely that you would have felt it manually! Mine was considered 'fairly small' tho my GP found it manually & the biopsy confirmed 2 lesions ... both cancerous. ..... Did they do another ultrasound on you between the surgeries to see if it still showed up? They Obviously wouldn't want to do another mammogram just yet .... too bloody sore! It could be a more 'liquid' one than tissue .... and it popped with the biopsy? Lots of questions to ask your surgeon! Did he show you where it 'was' from the initial mammogram & Ultrasound?
Take care, heal up from the surgeries & keep us in the loop with what happens next! In the meantime, check out this post about the 'other' areas on the forum - some of them are even for fun! Whack up pics of your art & craft & pets or your gardens, have a giggle at the 'funnies' ..... and add your own pics & comments on any of the threads or start your own! ;)
https://onlinenetwork.bcna.org.au/discussion/comment/201679Take care, all the best xx