Hi Kathleen, Congratulations on getting through your mastectomy and being cancer free! The expansion process is a frustrating time, but it is much easier if you use your surgeon to help you navigate it. These are good questions to ask at the time of your expansions-- my patients and I are constantly evaluating how far we have come, and discussing with each other what the optimal end result will be. A 550cc implant looks different in different patients, depending upon the thickness of the mastectomy flap, the profile of the implant, the width of the breast, etc. A general rule of thumb, is that each ~200cc is equal to a cup size. From your photo, 280cc's places you probably in a AA-A range (tough to say, because due to the expander shape, that volume wouldn't be distributed into the cup of the bra). I'd suggest that a 550cc implant might give you a breast in the B to B+ range, but losing more weight might change this and make the implants appear larger relative you your frame. Talk to your surgeon about your sizing concerns and discuss your implant options (also please have them evaluate that scabbed area over the right breast tissue expander). We usually use fat grafting to shape and contour the tissues of the upper breast and this further improves the breast shape. As you progress further through the expansion phase, the plan should become more clear. Hope this helps! Best wishes,Erik Hoy, M.D.Rhode Island Plastic Surgeon