Perianal endometriosis: An unusual cause of perianal pain

James Lee, Sarah Si Lin Tang, Judith Ong, Han Boon Oh, Bettina Lieske
In: Gynecology and Obstetrics Clinical Medicine · 2021 · vol. 1(4) , pp. 225–227 · doi:10.1016/j.gocm.2021.10.002 · W3210436724
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⚙ AI-generated summary by claude@2026-06, 2026-06-13 ⓘ

This case report details the diagnosis and surgical excision of perianal endometriosis in a 41-year-old female, likely caused by implantation following episiotomies.

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Abstract

Abstract Endometriosis is a common clinical condition where functional endometrial tissue is found outside the uterine cavity. Although most of this ectopic tissue tends to occur within the pelvis, on rare occasions, they can also be found in unusual locations, such as the thoracic cavity, perianal, episiotomy scar, and previous abdominal wound sites. This is a case report of a healthy 41-year-old Chinese female who presented with a painful perianal lump which was subsequently investigated and excised. The diagnosis of perianal endometriosis was made upon histological examination of the tissue. Many theories attempt to explain the phenomenon of endometriosis in the perianal region. In this case, the implantation theory is the likely explanation as the patient had a significant history of 3 normal vaginal deliveries which were followed by episiotomies. Advancements in endo-anal ultrasound (EAUS) have aided in the planning of surgery for this lesion.

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endometriosis

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Papers in the corpus that this work cites (lower rings, blue) and that cite this one (upper rings, green). Dot size scales with the paper's in-corpus citation count — bigger dot = more influential within the endo/adeno field. Click a dot to open that paper. [ expand to 2 hops ] — adds papers reached through this work's immediate citers/citees. Heavier; up to 60 extra dots.

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