Same Day Ambulatory Appendectomy (SAMBA)

Inclusion Criteria: * Patients aged 15-74 years * BMI ≤ 35 kg/m2 * Uncomplicated acute appendicitis confirmed by imaging (ultrasound and/or CT and/or MRI) * Temperature ≤ 38,1°C and \> 35,5°C * Appendix diameter \> 6mm and ≤ 15mm * Without effusion or with only localized peri-appendicular effusion * Infiltration of peri-appendicular fat without abscess or plastron * No sign of perforation * Leukocytes ≤ 18,000G/L AND * CRP (C reactive protein) ≤ 60mg/L * If pain, calmed by level 3 analgesic at maximum * Ambulatory criteria * Availability of monitoring by a relative during the 12 hours after discharge from the hospital * Residence located less than 20 minutes by car from a health center (hospital or clinic) * Access to a telephone mobile or fixed in case of problems * Signature of the written informed consent form by the patient * If the patient is a minor, signature of the written informed consent form by both parents or their legal representative * Affiliation to a French health insurance scheme or equivalent Exclusion Criteria: * Criteria that exclude ambulatory care such as an ASA score (Physical status score) \> 2, severe or uncontrolled comorbidities, severe pulmonary disease including obstructive sleep apnea, anticoagulation or antiplatelet drug or contraindication to ambulatory surgery such as intubation difficulties * Presence of active cancer, a malignant hemopathy, drug addiction, coagulopathy, immunosuppressive treatment * Non-acute or interval appendectomy, i.e. after antibiotic treatment of a complicated appendicitis of the plastron or drainage of an appendicular abscess; * History of pelvic surgery * Vulnerable people: pregnant or breast-feeding women (patients will undergo a pregnancy test: plasmatic β-hCG (human chorionic gonadotropin) or urinary test), adult under guardianship or deprived of freedom. Pregnant women are considered to have a full stomach, with risk of inhalation at anesthetic induction and represent a contraindication to ambulatory surgery. In addition, the need to perform abdominal surgery on a pregnant woman requires obstetric monitoring that is difficult to reconcile with management in an outpatient surgery unit (need for obstetric ultrasound or monitoring). * Suspicion of a tumor of the appendix : Mucocele and pseudomyxoma, Carcinoid tumor, Adenocarcinoma of the appendix, Another type of tumor