Although the person does not have the size of the breast, the contours are clear. The contour is the area where the nozzle is seated. By measuring these area diameters, it is decided which diameter of the prosthesis will be used. Then, the projection of the breast, the forward side of the projection of the patient and physician decide together to determine the size of the prosthesis. In addition, this size is decided by considering the person’s skin elasticity and body structure.