Acute Appendicitis or Appendiceal Diverticulitis? A Case Report and Systematic Literature Review

Background: Appendiceal diverticulitis is a rare and poorly understood condition of the appendix. The diagnosis of appendiceal diverticulitis is challenging due to its rarity and a clinical presentation that often mimics other ileocecal disorders. Unlike acute appendicitis, appendiceal diverticulitis may be associated with a higher risk of perforation, increased mortality, and a potential link to neoplasms. However, further research is necessary to enhance our understanding of its epidemiology, risk factors, clinical presentation, and outcomes. Case Report: A 53-year-old male presented to the emergency department with right lower abdominal pain. On physical examination, tenderness was noted in the right lower quadrant, without rebound tenderness or muscle guarding. Laboratory tests revealed leukocytosis and elevated C-reactive protein (CRP) levels. Ultrasonographic imaging of the ileocecal region suggested acute appendicitis, leading to a decision for surgical intervention. Laparoscopic exploration revealed multiple cylindrical, red, and edematous herniations, up to 4 mm in size, on the surface of the vermiform appendix. An appendectomy was performed. Histopathological examination confirmed appendiceal diverticulitis with surrounding peridiverticulitis. The surgery and early postoperative course were uneventful. Literature review: The study included 5 retrospective studies and 30 case reports, analyzing a total of 112 patients with appendiceal diverticulitis. Of these, 65.5% were male and 34.5% were female, with a median age of 49 years (IQR: 39-59). The most commonly reported clinical findings included pain in the right iliac fossa or right lower abdominal quadrant (56.5%), nausea (18.9%), vomiting (9.8%), rebound tenderness (24.6%), fever (15.6%), leukocytosis (25.4%), and elevated C-reactive protein levels (16.4%). Diagnosis was confirmed histopathologically in 86.9% of the cases via computed tomography imaging in 4.1% and ultrasonography in 1.6%. A histopathological analysis identified five neoplasms (4.1%), including two sessile serrated adenomas, two neuroendocrine carcinoids, and one mucinous tumor. Appendectomy was the treatment of choice, with no intraoperative or postoperative complications recorded and no mortality reported. The median hospital stay was 6.8 days (IQR: 3.0-6.8). Conclusions: Appendiceal diverticulitis should be considered as a differential diagnosis in patients presenting with symptoms resembling acute appendicitis. Early diagnosis and treatment are essential to reduce morbidity and mortality. Appendectomy is a safe and effective treatment approach for appendiceal diverticulitis.