Anal Fibroepithelial Polyp With Epithelial Vascular Pseudoinvasion.

In this article, we report a case of anal fibroepithelial polyp with benign squamous cell vascular pseudoinvasion. The patient was a 38-year-old Caucasian man, who presented at our institution for recurrent episodes of anal discomfort. Clinical evaluation revealed the presence of 2 pedunculated anal polyps that were resected and submitted for histological evaluation. On microscopic evaluation, one of the polyps shows epithelial endovascular displacement associated with morphological signs of traumatism. The differential diagnosis and possible pathogenetic mechanisms explaining the presence of such findings are discussed. To the best of our knowledge, this is the first case reported of an anal fibroepithelial polyp with epithelial vascular pseudoinvasion.