E. Nurmukhametova E. Nurmukhametova It has been established that the main link in the pathogenesis of acute appendicitis (OA) is obstruction of the lumen of the appendix and its inflammation. In the early 20th century, abdominal trauma was considered as a possible cause of OA, but no attempts were made to analyze this phenomenon. Some patients with posttraumatic appendicitis (PTA) already had asymptomatic mild inflammation of the appendix before the injury, and the injury contributed to the aggravation of the process. In other studies, researchers did not find any signs of prior inflammation. We will consider three cases of OA resulting from blunt abdominal trauma in boys aged 11, 8, and 7 years, who were hospitalized at various times after the injury with complaints of abdominal pain, nausea, or vomiting. On examination, all patients had local tenderness, protective muscle tension, and symptoms of peritoneal irritation upon palpation of the right iliac fossa, fever, and leukocytosis. Laparoscopy revealed gangrenous or phlegmonous appendicitis with periappendiceal infiltrate in all cases. All patients underwent appendectomy. Direct damage to the appendix is ??extremely rare in cases of abdominal trauma due to its small size and high mobility. Local intestinal spasm resulting from trauma may trigger the development of the pathological process, and hyperemia and edema following the spasm lead to obstruction of the lumen of the appendix. Other possible mechanisms for the development of PTA are: — ileocecal hematoma; — mesenteric rupture and subsequent edema, leading to enlargement of the mesenteric lymph nodes; — displacement of feces and gas into the appendix and its obstruction. A review of the world literature on blunt abdominal trauma and the results of the present study allow us to make some generalizations: — symptoms appear within a few hours to 3 days after the injury; — perforated appendicitis is observed in most cases; diffuse peritonitis develops in approximately 1/3 of patients; fecal matter is found in the lumen of the appendix in some patients. Thus, blunt abdominal trauma can be considered as a possible cause of blunt abdominal trauma, which requires urgent surgical intervention. References: Serour F, Efrati Y, Klin B, et al. Acute Appendicitis Following Abdominal Trauma Arch Surg 1996;131:785-6.