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