Inflammatory cloacagenic polyp
Anus and anal canal
Inflammatory cloacagenic polyps, first described in 1981
Lobert PF, Appelman HD (1981)
, are commonly associated with mucosal prolapse and sometimes with haemorrhoids
Inflammatory cloacogenic polyp. A unique inflammatory lesion of the anal transitional zone.
Am J Surg Pathol 5: 761-6
Chetty R, Bhathal PS, Slavin JL (1993)
Prolapse-induced inflammatory polyps of the colorectum and anal transitional zone.
Histopathology 23: 63-7
Levey JM, Banner B, Darrah J, Bonkovsky HL (1994)
. These polyps arise in the anal transitional zone (ATZ) and form a rounded or irregular mass measuring 1–5 cm in diameter. Histologically, the polyp consists of hyperplastic rectal mucosa, partly covered with ATZ-type or squamous epithelium. The surface is typically eroded and the stroma shows oedema, vascular ectasia, inflammatory cells and granulation tissue. Vertically oriented smooth-muscle fibres are found between the elongated and tortuous crypts. It can be confused with a prolapsed rectal adenoma
Inflammatory cloacogenic polyp: three cases and literature review.
Am J Gastroenterol 89: 438-41
Parfitt JR, Shepherd NA (2008)
Polypoid mucosal prolapse complicating low rectal adenomas: beware the inflammatory cloacogenic polyp!
Histopathology 53: 91-6
Bosman FT, Carneiro F, Hruban RH, Theise ND (Eds.)
WHO Classification of Tumours of the Digestive System.
International Agency for Research on Cancer: Lyon 2010
Topographic definition of the anal canal, anal margin and perianal region