Is it Necessary to Drain in Contact With the Prostheses During a Cure of a Ventricle With Retromuscular Prosthesis?

Inclusion criteria: * Adult patient (≥18 years old) * Patient operated on at HUS between 01/01/2018 and 12/31/2020 * Patient who has undergone surgical cure of anterior or lateral abdominal wall eventration of any width with placement during the procedure of a prosthetic mesh in a prefascial retromuscular position. * Patient not objecting to the reuse of their data for scientific research purposes. Exclusion criteria: * Patient who has expressed opposition to the reuse of his or her data for scientific research purposes. * Particular clinical forms of the disease: absence of previous surgical intervention (and thus absence of ventration: umbilical hernia, diastasis) * Absence of prosthesis during the operation or prosthesis placed in intraperitoneal position