Brooke Davis, a 40-year-old mom from Cedar Rapids, Iowa, went in for a routine mammogram a few years ago and discovered she had breast cancer. The diagnosis is jarring for any woman, especially at the age of 40, and Davis was already living with multiple sclerosis , or MS, a chronic disease of the central nervous system that can cause problems with vision, balance and muscle control. With her breast cancer diagnosis, Davis said she braced herself for a complicated medical journey that would include a mastectomy. "My mom had just had one two years prior," Davis told ABC News. "I wasn't sure if I was going to be a candidate for reconstructive [surgery], and so being younger, that was really my biggest worry." After hearing Davis' concerns and past struggles with MS, her doctor, Dr. Vincent R

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