**4.5 Prognostic study of a lesion and its aggressiveness**

In 2011 and 2014, Evans was one of the pioneers in the description of the relationships between the size of the lesions, the increase in elasticity and the aggressiveness of the tumour, the contamination of the lymph nodes, the lympho-vascular invasion and the histological grade of the cancer [7–10].

The hardest cancers are more invasive with a median value of 180 kPa and the highest histological grade. Median elasticity values of 126 kPa correspond to ductal cancers in situ. Benign lesions have a median score of 45 kPa. Lipomas have a score of 14 kPa, with 97% sensitivity and 88% specificity. These data can thus be considered as predictive (**Figures 8** and **12**).

**Figure 9.** *SWE multi-slides technic of a malignant lesion = 123 kPa.*
