The investigators wish to highlight, in a Case-Control design, if there is an increased concentration of BFRs in omental adipose tissue of cases ( women with severe endometriosis with surgical indication ) versus bioaccumulation recorded in a control cohort ( women recruited in obstetrics and gynecology or visceral surgery showing no sign of endometriosis ) . Pairing will be operate on Age (+/- 5 years compared to the case ) , BMI ( BMI 5 Classes described by the HAS) and previous breastfeeding experience (yes / no , opposite the release expected bioaccumulate contaminants in breast adipose tissue , when the lactation ) .

Inclusion criterion for de cases :

• Age : 18-45 years old
• Deep endometriosis with or without endometriomas that need surgery (clinical examination, MRI, surgery)
• Accessing to the omental and/or parietal adipose tissue
• Non opposition of the patients for the samples collection and consent for the present study.

Inclusion criterion for the controls :

• Patients without any history of endometriosis and without suggestive symptomatology. Often patients operated for cesarean section.
• Possible access to the adipose tissue of the omentum or abdominal wall

Exclusion criterion for the cases :

• Pregnancy
• Death

Exclusion criterion for controls :

• Pregnancy
• Death

38 women with severe and deep endometriosis, aged 18 to 45 years old and hospitalized at Nantes University Hospital for surgical indication of endometriosis lesions ablation.

And 38 women aged 18 to 45 years old without suggestive signs of endometriosis