title: Appendicopathy--a clinical and diagnostic dilemma.
abstract: OBJECTIVE
  The term "neurogenic appendicopathy" has been used for patients operated on for acute appendicitis with their appendices lacking signs of acute inflammation. The aim of this retrospective study was to clarify the presence of potential neurogenic appendicopathies, analyzing patients' clinical symptoms and their corresponding appendiceal specimens.
  
  
  METHODS
  One hundred twenty-one patients were identified showing a histological diagnosis of chronic appendicitis. Eventually, 40 patients qualified for the potential diagnosis "neurogenic appendicopathy." Appendix specimens were immunohistochemically examined for the expression of S-100, vasoactive intestinal polypeptide (VIP), and substance P. Controls consisted of 110 patients with acute appendicitis and 120 patients following appendectomies operated on for other reasons.
  
  
  RESULTS
  Eventually, 40 of 120 patients qualified for the potential diagnosis "neurogenic appendicopathy." Compared to patients with acute appendicitis, there was only little difference in clinical symptoms. Histologically, neuromas, thought of being characteristic of neurogenic appendicopathy, were demonstrated significantly more often in the control group (p = 0.01). S-100 was significantly more expressed in the appendicopathy group (p = 0.0024), but nearly 50% of control specimens showed an intense staining, too. S-100(+) neurofibers were significantly (p = 0.00122) more often found in the mucosa of appendicopathy specimens, but this was true for only 25% of specimens. VIP was more strongly expressed in control specimens (p = 0.0211). Substance P was of no diagnostic value.
  
  
  CONCLUSIONS
  Our study could not confirm the neurogenic origin of appendicopathies. Yet, clinical data strongly suggest the existence of the entity "appendicopathy." Therefore, we suggest removing a macroscopically unaffected appendix in patients with appendicitis-like symptoms if, on laparoscopy, no other cause can be found.
authors.affiliation: Department of General, Visceral, Thoracic and Vascular Surgery, University Medicine, Greifswald, Ernst-Moritz-Arndt-University, Ferdinand Sauerbruchstraße 8, 17475 Greifswald, Germany. partecke@uni-greifswald.de
authors.forename: Lars Ivo
authors.initials: LI
authors.lastname: Partecke
authors.forename: Andrea
authors.initials: A
authors.lastname: Thiele
authors.forename: Franziska
authors.initials: F
authors.lastname: Schmidt-Wankel
authors.forename: Wolfram
authors.initials: W
authors.lastname: Kessler
authors.forename: Michael
authors.initials: M
authors.lastname: Wodny
authors.forename: Frank
authors.initials: F
authors.lastname: Dombrowski
authors.forename: Claus-Dieter
authors.initials: CD
authors.lastname: Heidecke
authors.forename: Wolfram
authors.initials: W
authors.lastname: von Bernstorff
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D000368:Aged; D001062:Appendectomy; D001064:Appendicitis / Q000175:diagnosis* / Q000473:pathology*; D001065:Appendix / Q000378:metabolism / Q000473:pathology*; D002648:Child; D002908:Chronic Disease; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D010535:Laparoscopy; D008297:Male; D008875:Middle Aged; D009418:S100 Proteins / Q000378:metabolism; D013373:Substance P / Q000378:metabolism; D014660:Vasoactive Intestinal Peptide / Q000378:metabolism; D055815:Young Adult
chemical_list: D009418:S100 Proteins; D013373:Substance P; D014660:Vasoactive Intestinal Peptide