New morphological findings in so-called negative appendectomies

Area of Science:

• Pediatric Surgery
• Surgical Pathology
• Histology

Background:

• The diagnosis of acute appendicitis in children often leads to appendectomy.
• Histological examination of removed appendices is standard practice to confirm diagnosis.
• A subset of appendectomies yields 'normal' histological findings, termed 'negative appendectomies'.

Purpose of the Study:

• To re-evaluate appendices from children initially classified as histologically normal after surgery for acute appendicitis.
• To compare these findings with cases of catarrhal and early phlegmonous appendicitis.
• To determine if subtle pathological changes exist in 'negative appendectomy' specimens.

Main Methods:

• Revision of appendiceal specimens from pediatric patients originally diagnosed with acute appendicitis but showing normal histology.
• Application of special assays to re-examine these specimens.
• Comparative analysis with appendectomy specimens from patients with confirmed catarrhal and early phlegmonous appendicitis.

Main Results:

• Pathological changes in the epithelium and lymphatic tissue were identified in over two-thirds of specimens previously classified as normal.
• These findings suggest that initial histological assessments may overlook subtle abnormalities.
• The prevalence of these changes indicates a need for re-evaluation of the 'negative appendectomy' classification.

Conclusions:

• The term 'negative appendectomy' requires redefinition based on the presence of subtle pathological changes.
• Special assays can reveal abnormalities missed by standard histological examination in pediatric appendectomies.
• Further research is warranted to understand the clinical implications of these redefined 'negative appendectomies'.