title: Appendiceal diverticulitis and acute appendicitis: differences and similarities.
abstract: BACKGROUND
  Acute appendiceal diverticulitis is an unusual cause of acute abdomen, considered clinically indistinguishable from acute appendicitis.
  
  
  METHODS
  In a historic cohort study with 27 cases of appendiceal diverticulitis and 54 cases of acute appendicitis, we compared clinical characteristics, diagnostic tests and pathology findings of the two processes.
  
  
  RESULTS
  Mean age at presentation was lower in acute appendicitis (37.24 +/- 19.98 vs. 54.81 +/- 17.55 years, p < 0.001), with significant differences between men (33.33 +/- 15.89 vs. 57 +/- 18.02 years, p < 0.001) but not between women (41.76 +/- 24.87 vs. 50.44 +/- 16.69 years, p = 0.34). In the diverticulitis group, 48.15 % had leukocytosis vs. 81.48 % in the appendicitis group (p = 0.02); there was no difference in leukocyte count (13770.37 +/- 4382.55 vs. 14279.63 +/- 4268.59, p = 0.61). Patients with appendiceal diverticulitis had a higher incidence of appendiceal mucocele (p = 0.01) and a lower proportion of appendiceal gangrene (p = 0.03). There were no differences in appendiceal perforation or ulceration. Symptom duration before emergency department attendance (71.61 +/- 85.25 hours vs. 36.84 +/- 33.59 hours; Z = -3.1 p = 0.002), duration of surgery (85 +/- 40 minutes vs. 60 +/- 21 minutes, Z = -3.2, p = 0.001) and the presence of appendicular plastron was higher in patients with diverticulitis vs. appendicitis (8 vs. 5 patients [p = 0.01, Odds ratio 2.2]).
  
  
  CONCLUSIONS
  Appendiceal diverticulitis presents a series of clinical, epidemiological and pathological differences with respect to acute appendicitis. The former shows a more indolent course with delayed diagnosis.
authors.forename: Irene
authors.initials: I
authors.lastname: Lobo-Machín
authors.forename: Luciano
authors.initials: L
authors.lastname: Delgado-Plasencia
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Hernández-González
authors.forename: Alejandro
authors.initials: A
authors.lastname: Brito-García
authors.forename: Guillermo
authors.initials: G
authors.lastname: Burillo-Putze
authors.forename: Alberto
authors.initials: A
authors.lastname: Bravo-Gutiérrez
authors.forename: Antonio
authors.initials: A
authors.lastname: Martínez-Riera
authors.forename: Vicente
authors.initials: V
authors.lastname: Medina-Arana
mesh_terms: D000208:Acute Disease; D000328:Adult; D000368:Aged; D001064:Appendicitis / Q000175:diagnosis / Q000628:therapy*; D015331:Cohort Studies; D003937:Diagnosis, Differential; D018450:Disease Progression; D004238:Diverticulitis / Q000175:diagnosis / Q000628:therapy*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies