Following a swelling on my left axilla, I had an ultra sound on my left breast and then a mammogram. It turns out that I have about 5 cysts in my left breasts. However, the mammogram has spotted a thickening in the right breast! The report states that they suspect it could be a cyst or fibroadenoma (I think - I don't have a copy of the report). My doctor has sent me for an ultra sound and then to a breast specialist/surgeon to read the results - is this normal and should I be worried. Can they tell the difference between presentationof a cyst or something more worrying from a mammogram? My doctor said at this stage he is not too worried. The reports states that the area is well defined and about 3.4cm.