MRI

If private you possibly could have a larger implant with a matrix sling. The expander can be enlarged quite rapidly and they can do the changeover once any treatment is finished. They really only recommend mastectomy if necessary. You would be too disfigured with a lumpectomy and ultimately would have a better end  appearance. If an expander is put in at the time of mastectomy the changeover is relatively minor and you possibly won't need to wait as long. Your breast car nurse can give you a soft breast form to balance your appearance.  Only you will know. Have you been connected with a breast care nurse? They will be able to go through a lot of this with you and explain surgical options etc.