The Incidental Diagnosis of Adenomatoid Tumour on Fallopian Tubes Submitted for Tubal Ligation at a Tertiary Laboratory in Northern Pretoria, South Africa.

Introduction: Adenomatoid tumours are the most common benign mesothelial neoplasms of the fallopian tube. They are usually diagnosed incidentally in specimens submitted for bilateral tubal ligation and can be mistake for vascular or epithelial lesions.

Materials and methods: A retrospective analysis of cases with adenomatoid tumour of the fallopian submitted for tubal ligation from 2012 to 2020. The clinicopathological characteristic data was retrieved from the laboratory information system.

Results: A total of 11 cases with adenomatoid tumour of the fallopian tubes submitted for tubal ligation were identified in women with average age of 30.9 years. In all the cases, only 1 fallopian tube was affected. Grossly, the fallopian tubes did not show any discernible tumour. Immunohistochemical stains confirmed the diagnosis of adenomatoid tumours in all the cases.

Conclusion: Adenomatoid tumours in fallopian tubes are infrequent, and pathologists shouldn't overlook them especially in unsuspicious instances. As frequent as adenomatoid tumour of the fallopian tubes are uncommon, pathologists show be aware of as their misdiagnosis could lead mismanagement of patient with far reaching complication.