Conventional laparoscopic appendectomy(CLA) is the current standard treatment. To obtain additional benefits such as a better cosmetic outcome, the investigators developed a surgical option termed suprapubic single-incision laparoscopic appendectomy (SSILA), which creates a non-visible scar, that was preliminarily shown to be feasible and safe in our previous retrospective studies To further evaluate the feasibility, safety and cosmetic results of this innovative approach, the investigators compared the outcomes of SSILA and CLA by performing a randomized controlled trial.

Inclusion Criteria:

• acute appendicitis or interval appendicitis
• informed consent

Exclusion Criteria:

• diagnosis of appendicitis was not clinically established (symptoms attributable to urinary or gynecological problems)
• history of cirrhosis and coagulation disorders
• suspected or proven malignancy
• contraindication to general anesthesia (severe cardiac and/or pulmonary disease)
• inability to give informed consent(severe mental disease)
• pregnancy
• BMI>30kg/m2
• generalized peritonitis