Retroperitoneal Endometriotic Cyst Infiltrated in the Iliopsoas Incidentally Found in a Patient with Acute Back Pain

Nanami Tsukasaki, Takuro Yamamoto, Akihisa Katayama, Nozomi Ogiso, Tomoharu Okubo
Case reports in obstetrics and gynecology · 2017 · vol. 2017(1) , pp. 2302568 · doi:10.1155/2017/2302568 · PMID:29410925 · PMC5749264 · W2780009787
article OA: gold CC0 ⤵ 2 in-corpus citations
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⚙ AI-generated summary by claude@2026-06, 2026-06-10 ⓘ

This paper reports a rare case of a retroperitoneal endometriotic cyst infiltrating the iliopsoas muscle, incidentally discovered in a patient presenting with acute back pain.

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Abstract

We describe a rare case of retroperitoneal endometriotic cyst infiltrated in the iliopsoas incidentally found in a patient with acute back pain. Endometriosis at the pelvic peritoneum, including the Douglas pouch, has been reported often; there are few reports of cystic endometriosis in the retroperitoneal cavity. Today there are various theories regarding how endometriosis occurs. By pathological findings and lesion sites of the present case, we concluded that the endometrial tissues in the menstrual blood might metastasize lymphatically and implant and form the retroperitoneal cyst.

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endometriosis

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