obsolete_fibroepithelial polyp of the anus true DOID:8170 Sirarat Sarntivijai http://purl.obolibrary.org/obo/MONDO_0006549 http://www.pubcan.org/icdotopo.php?id=5867 Also called fibrous polyp or anal tag, this is one of the most frequent anal lesions and is found at the dentate line, anal mucosa or in the perianal skin  . Fibroepithelial polyps may be associated with local inflammation such as fissure or fistula  . Granulomas can be found in about one third of skin tags in cases of Crohn disease  . Others may represent the end stage of a thrombosed haemorrhoid, but remnants of haemorrhoidal vessels or signs of previous bleeding are rarely found. Most are probably of idiopathic nature as the incidence is rather similar in patients with or without anal diseases. Grossly, the polyp is spherical or elongated with a greater diameter ranging from a few millimetres up to 4 cm. The surface is white or grey and may show superficial ulceration. Histologically, it consists of a fibrous stroma covered by squamous epithelium, which usually is a slightly hyperplastic and may be keratinized. The stroma may be more or less dense and often contains fibroblastic cells with two or more nuclei and a considerable number of mast cells  . Neuronal hyperplasia is a common feature. 3.88.0 Replaced by Mondo term MONDO_0006549, with which this term was previously merged. Use: http://purl.obolibrary.org/obo/MONDO_0006549