A Case of Appendiceal Endometriosis Diagnosed as Low-Grade Appendiceal Mucinous Neoplasm

Keisuke Ihara, Saturu Yamaguchi, Yosuke Shida, Junki Fujita, Haruka Yokoyama, Hideo Ogata, Hajime Kuroda, Hiroyuki Kato
In: Nippon Daicho Komonbyo Gakkai Zasshi · 2017 · vol. 70(2) , pp. 73–77 · doi:10.3862/jcoloproctology.70.73 · W2581909945
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⚙ AI-generated summary by gemini-2.5-flash-lite, 2026-06-08 ⓘ

A case of appendiceal endometriosis presented as a mucinous neoplasm, highlighting the need to consider endometriosis in the differential diagnosis of appendiceal cystic lesions.

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⚙ AI-generated deep summary by claude@2026-06, 2026-06-09 · read from full text ⓘ

This paper reports a case of a 48-year-old woman who presented with bleeding during defecation and, on lower gastrointestinal endoscopy, was found to have a submucosal-appearing lesion with redness at the appendiceal orifice. CT and ultrasound identified a cystic lesion, and the patient underwent laparoscopic ileocecal resection (D2) for a preoperative diagnosis of appendiceal mucinous cyst/appendiceal mucinous tumor. Histopathology ultimately diagnosed appendiceal endometriosis, noting that imaging can be difficult to distinguish from other appendiceal mucinous neoplasms and non-neoplastic cysts, which often lead to surgery for diagnosis and treatment. This paper is centrally about endometriosis — specifically a rare case of appendiceal endometriosis mimicking an appendiceal mucinous neoplasm.

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Abstract

48歳女性．排便時出血の主訴で前医を受診し，下部消化管内視鏡検査にて虫垂口に発赤を伴う粘膜下腫瘤を認めた．CT，超音波検査でも嚢胞性病変が指摘され，虫垂粘液嚢腫の診断で腹腔鏡下回盲部切除術（D2）を施行．病理組織学的検査にて虫垂子宮内膜症の診断となった．虫垂粘液嚢腫の所見を呈する疾患として，虫垂粘液腺腫，虫垂粘液嚢胞腺癌のほかに非腫瘍性嚢胞が含まれる．上記疾患は画像上否定することは困難であり，多くの場合で診断・治療目的に手術が行われることが多い．本症例のように虫垂子宮内膜症を原因とした虫垂粘液腫の可能性もあり，術前の鑑別診断として考慮する必要があると思われた．虫垂子宮内膜症による虫垂粘液腫はこれまでにほとんど報告がなく，医中誌で検索しえた限りで本邦では5例のみであった．若干の文献的考察を加え報告する．
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症例報告 虫垂粘液性腫瘍の診断で摘出された虫垂子宮内膜症の1例 2017 年 70 巻 2 号 p. 73-77 詳細 抄録 48歳女性．排便時出血の主訴で前医を受診し，下部消化管内視鏡検査にて虫垂口に発赤を伴う粘膜下腫瘤を認めた．CT，超音波検査でも嚢胞性病変が指摘され，虫垂粘液嚢腫の診断で腹腔鏡下回盲部切除術（D2）を施行．病理組織学的検査にて虫垂子宮内膜症の診断となった．虫垂粘液嚢腫の所見を呈する疾患として，虫垂粘液腺腫，虫垂粘液嚢胞腺癌のほかに非腫瘍性嚢胞が含まれる．上記疾患は画像上否定することは困難であり，多くの場合で診断・治療目的に手術が行われることが多い．本症例のように虫垂子宮内膜症を原因とした虫垂粘液腫の可能性もあり，術前の鑑別診断として考慮する必要があると思われた．虫垂子宮内膜症による虫垂粘液腫はこれまでにほとんど報告がなく，医中誌で検索しえた限りで本邦では5例のみであった．若干の文献的考察を加え報告する． © 2017 日本大腸肛門病学会 この記事はクリエイティブ・コモンズ [表示 - 非営利 - 改変禁止 4.0 国際]ライセンスの下に提供されています。 https://creativecommons.org/licenses/by-nc-nd/4.0/deed.ja

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endometriosis

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