The relative distribution of fibroglandular and fat tissues varies significantly depending on patient’s age, menstrual cycle, pregnancy/lactancy, hormone therapy and menopause, which affects the structure and morphology of the breast . The ratio of these two types of tissues defines the breast density, which among other factors, can be related to the risk of developing breast cancer. In fact, women with a higher breast density are more likely to develop breast cancer . Because fibroglandular and fat tissues have different mechanical behaviours, breast density also influences the aesthetical outcome of BCS, alongside with other breast characteristics, such as size and volume. Other factors that influence the deformations caused by BCS are the tumor size and location. Additionally, surgery-related factors such as the used technique, the placement of incisions, the volume of excised tissue or varying surgeon expertise lead to different types and extents of shape deformations . Although the extent of the scar, color alterations or roughness of the treated breast also weight in its visual appearance, in this work only shape and geometry related deformations are modelled.