When Cherie Sanders’ doctor in Amarillo diagnosed her with breast cancer, he described her tumor as “5 centimeters by 2.5 centimeters” and “the size of a walnut.”

These words left Cherie wondering what her tumor really looked like. Walnuts vary in size, so how big was it? Was it round or asymmetrical?

Cherie got answers at MD Anderson, where she sought a second opinion. Here, doctors provided her with a 3D-printed replica...