PurposeWomen diagnosed with early breast cancer are faced with a choice of surgical procedures. Although one of the essential factors in surgical shared decision making is the impact on the body image, the breast morphology after breast conserving surgery is particularly difficult to explain in a uniform manner due to large individual differences. MethodsPatients with breast cancer eligible for breast conserving surgery (BCS) were recruited between June 2020 and October 2021. We surveyed the patients’ satisfaction with our explanation method about breast morphology after BCS using 3D breast imaging in the form of a questionnaire.ResultsA total of 162 patients were enrolled and 137 (84.6%) answered the questionnaire. One hundred and sixteen patients (84.6%) answered that they were very satisfied or satisfied with our explanation method and 100 (73.0%) patients were very satisfied or satisfied with the 3D breast imaging. Some patients answered that visually understanding the breast morphology by 3D breast imaging helped them to prepare for BCS, or on the contrary, made them chose mastectomy with breast reconstruction because the postoperative deformation of BCS was found to be unacceptable. Only a few patients who actually underwent BCS felt that their postoperative morphology was more deformed than the preoperatively imagined one.ConclusionOur results suggest that our preoperative explanation method using 3D breast imaging was useful for shared decision making. We think that 3D breast imaging can help the patients to visualize the individual shape of their breast, and the tumor position and size.