Objective To explore the feasibility of a modified technique of extracorporeal appendectomy assisted by transumbilical single-site laparoscopy for non-encapsulated appendicitis in children.Methods Between June 2022 and December 2023,extracorporeal appendectomy assisted by transumbilical single-site laparoscopy was performed in our department for non-encapsulated appendicitis in 30 children(aged from 2 to 6 years old).A 5 mm trocar and a 30° laparoscope were inserted in the center of the umbilicus,and a 5 mm trocar and operating forceps were inserted at the lower edge of the umbilicus.The diseased appendix was explored and located.Non-invasive laparoscopic grasping forceps were used to clamp the head or center of the appendix.The tissue between the two trocar ports was cut open with the use of an electric knife.The appendix and distal cecum were pulled out of abdominal cavity to ligate the appendix root and mesentery.Then the appendix was disconnected with an electric hook.Results The operating time of the 30 cases was 15-22 min(average,18.0±2.5 min).Patients got out of bed and walked around at 6-8 h after surgery,and passed flatus and consumed liquid food within 1 d after surgery.Postoperative hospitalization was 2-5 d(average,3.5 d).Follow-ups for 1-15 months(average,4.5 months)showed no complications such as incision infection,adhesive intestinal obstruction,or pelvic abscess.Conclusion Transumbilical single-site laparoscopy assisted extracorporeal appendectomy is an effective procedure to resect the appendix,with characteristics of handy and convenient performance,being suitable for non-encapsulated appendicitis.