Background. Acute appendicitis is a common emergency surgical pathology, with laparoscopic appendectomy being the “gold standard” in its treatment.Aim. We report a clinical case of laparoscopic appendectomy with immersive appendiceal stump closure in a patient with vermiform appendix abnormality.Materials and methods. Patient K. was emergently admitted to the Surgical Hospital of Ekaterininskaya Clinic in June 2019 with a clinical picture of acute appendicitis. Symptoms, disease anamnesis, instrumental and laboratory examinations conformed to acute appendicitis.Results and discussion. The patient was rendered an emergent surgery. Intraoperative picture corresponded to acute phlegmonous appendicitis with malformation (a wide conical base) of the vermiform appendix. Immersive appendiceal stump closure was chosen as treatment. Alternative opinions coexist on justifying a particular appendiceal stump closure strategy. Immersive treatment is our method of choice in terms of implementation and safety in the particular clinical case. Th is method requires the surgeon’s technical experience.Conclusion. A clinical case is reported of performing laparoscopic appendectomy with immersive appendiceal stump closure in a patient with vermiform appendix malformation. Despite the appendix abnormality, immersive treatment of the appendiceal stump was justified as safe in this case and entailed no complications in postoperative period.