Malignant Transformation of Endometriosis: An Unusual Diverticular Mass

S Mohling, Rayan Elkattah, Rachel Eliason, Todd Boren
In: Journal of Endometriosis and Pelvic Pain Disorders · 2016 · vol. 8(2) , pp. 67–70 · doi:10.5301/je.5000239 · W2507622955
article OA: closed CC0 ⤵ 2 in-corpus citations
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⚙ AI-generated summary by claude@2026-06, 2026-06-07 ⓘ

This case report describes malignant transformation of endometriosis into endometrioid adenocarcinoma of a colonic diverticulum in a patient receiving unopposed estrogen after hysterectomy.

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Abstract

Background Malignant transformation of endometriosis may occur years following hysterectomy and oophorectomy. It may present with a pelvic mass, pain or vaginal bleeding. Risk factors have been poorly defined, but may include exogenous or endogenous unopposed estrogens. Case This report presents a case of malignant transformation of endometriosis resulting in endometrioid adenocarcinoma of a colonic diverticulum in a patient on unopposed estrogen. Conclusions Patients with a history of endometriosis who present with a pelvic mass should be evaluated for the possibility of a tumor arising from the endometriosis, even long after definitive surgical treatment. Sampson's criteria for malignant transformation of endometriosis remain relevant. The continued practice of prescribing unopposed estrogen after hysterectomy to patients with a history of endometriosis may contribute to the frequency of this otherwise uncommon disease.

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endometriosis

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