{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,23]],"date-time":"2026-06-23T22:14:33Z","timestamp":1782252873945,"version":"3.54.5"},"reference-count":20,"publisher":"Wiley","issue":"11","license":[{"start":{"date-parts":[[2014,10,31]],"date-time":"2014-10-31T00:00:00Z","timestamp":1414713600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Pathology International"],"published-print":{"date-parts":[[2014,11]]},"abstract":"<jats:p>A uterus\u2010like mass is an extrauterine mass with a cavity lined by endometrial tissue and a smooth muscle layer resembling the uterine corpus. It is a rare condition of unknown histogenesis. Herein, we describe a case of clear cell carcinoma arising from a uterus\u2010like mass located in the retroperitoneal space. The patient, a 67\u2010year old nulliparous woman, had been followed with the diagnosis of an ovarian endometriotic cyst for 14 years until ultrasonography and magnetic resonance imaging (<jats:styled-content style=\"fixed-case\">MRI<\/jats:styled-content>) demonstrated an enlargement of the cystic mass with a thickened irregular wall. Suspicion of malignant transformation prompted us to excise the lesion. At laparotomy, the uterus and right ovary appeared normal, and a mass measuring 8\u2009cm was identified in the retroperitoneal space without any connection to the uterus. Grossly, the removed mass was composed of a cyst filled with blackish\u2010brownish fluid and a thick wall resembling uterine myometrium. Microscopically, endometrial tissue inside the cyst, which was diffusely lined by clear cell carcinoma, was identified. Although the histogenesis of a uterus\u2010like mass remains unclear, this case indicates that malignant tumors may occur from a uterus\u2010like mass through the pathway similar to the carcinogenesis of endometriosis\u2010related ovarian neoplasms.<\/jats:p>","DOI":"10.1111\/pin.12218","type":"journal-article","created":{"date-parts":[[2014,10,31]],"date-time":"2014-10-31T07:22:35Z","timestamp":1414740155000},"page":"576-580","source":"Crossref","is-referenced-by-count":15,"title":["Clear cell carcinoma arising from a uterus\u2010like mass"],"prefix":"10.1111","volume":"64","author":[{"given":"Baku","family":"Nakakita","sequence":"first","affiliation":[{"name":"Department of Gynecology and Obstetrics Kyoto University Graduate School of Medicine  Kyoto Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kaoru","family":"Abiko","sequence":"additional","affiliation":[{"name":"Department of Gynecology and Obstetrics Kyoto University Graduate School of Medicine  Kyoto 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