A clinical questionnaire is completed by the investigator (chest circumference, thorax turn, breast "measurements").

The breast density is assessed by the surgeon and scored from 1 to 5 (Likert scale) and then by the MyotonPRO The volumetric measurement of the breast is performed using the 3D digital camera. The patient is bent forward with hands resting on a chair during 30 seconds to 1 minute. The 3D digital camera rotates around the breast to capture the volume of the breast.

Intraoperatively, the weight of tissues removed is weighed (in grams), recorded in the observation notebook.

In post-operative (4 months), the possible long-term complications related to the intervention (mainly the dissatisfaction of the patient as for the aesthetic result) are collected then a new acquisition of the mammary volume is carried out with the digital camera 3D.

Once this measurement is completed, participation in the study is complete

After inclusion,are carried out:

• estimation of the volume of the breast to be reduced with the 3D digital camera
• measurement of breast density by Likert scale and MyotonPRO

The volumetric measurement of the breast is performed using the 3D digital camera. The patient is bent forward with hands resting on a chair to be as still as possible over a period of 30 seconds to 1 minute. The 3D digital camera rotates around the breast to capture the volume of the breast.

In peroperative, the weight of tissues removed is weighed (in grams). The removed weight is recorded in the observation notebook.

In postoperative (4 months), the possible long-term complications related to the intervention (mainly the dissatisfaction of the patient as for the aesthetic result) are collected then a new acquisition of the mammary volume is carried out with the digital camera 3D.

Once this measurement is completed, participation in the study is complete.

To study the association between the weight of tissues removed during the intervention and the variation of the breast volume (pre / postoperative) measured by the Créaform® GOPRO 3D digital camera adjusted on the density of the gland measured by electronic palpation (MyotonPRO).

Primary judgment criterion:

Coefficient associated with volume variation in the linear regression model (model 1) explaining weight by volume variation and density measured by electronic palpation.

To study the association between the weight of tissues removed during the procedure and the variation of the breast volume (pre / postoperative) measured by the Créaform® GOPRO 3D digital camera adjusted on the density of the gland estimated by manual palpation (Likert scale from 1 to 5).

Secondary judgment criterion 1:

Coefficient associated with volume variation in the linear regression model (Model 2) explaining weight by volume variation and estimated density by manual palpation.