Incidental Lesions In Appendectomy Specimens: Rare Or Rarely Sampled?

OBJECTIVE: During the microscopic examination of the specimens after appendectomy operations performed due to acute appendicitis, pathologists may encounter some incidental and unusual lesions. Appendectomy specimens are sampled as 3 sections/1 paraffin block in many centers. In this study, we aimed to evaluate whether multiple and dense sampling of appendix specimens has an impact on the incidence of incidental lesions of the appendix.METHODS: This study is a retrospective study of 1154 patients who underwent appendectomy with presumed acute appendicitis at the Department of General Surgery, Istanbul University-Cerrahpasa, Cerrahpasa Faculty of Medicine, had histopathological evaluation between 2007-2011 and 2014-2018. Group 1 was made up of the patients whose appendix specimens were examined as 3 sections/1 paraffin block. Group 2 was made up of the patients whose appendix specimens were sampled completely. In this study, it was evaluated whether there was a difference between the two groups concerning incidence of incidental benign and malign appendix lesions.RESULTS: There were 579 patients in Group 1, 575 patients in Group 2, and the mean age of the groups was 26 and 28, respectively. Neither acute appendicitis findings nor any of the other unusual lesions were found in 57 specimens (9.8%) in Group 1 and 58 specimens (10.1%) in Group 2. Unusual pathological findings were detected in six specimens in Group 1 and 21 in Group 2. All unusual lesions, including benign and malignant, were significantly higher in Group 2 than in Group 1 (p=0.013). Concerning the incidence of malignant incidental lesions alone, there was no significant difference between the two groups (p=0.136).CONCLUSION: Multiple and dense sampling of appendectomy specimens increases the likelihood of detecting unusual lesions of the appendix.