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We reported a case of mixed endometrioid and clear cell carcinoma arising from port site endometriosis. The patient was a 49\u2010year\u2010old woman with a history of laparoscopic excision of ovarian endometrioma. Physical examination revealed a subcutaneous solid tumor around the laparoscopic surgical scar. Imaging showed a suspicious malignancy. She underwent radical marginal resection of the abdominal wall tumor, flap reconstruction of the abdominal wall, hysterectomy, bilateral salpingo\u2010oophorectomy and omental biopsy. Histological examination revealed mixed endometrioid and clear cell carcinoma. Computed tomography scan showed no evidence of recurrence after six cycles of chemotherapy. This is the first case of malignant transformation from laparoscopic trocar site endometriosis.<\/jats:p>","DOI":"10.1111\/jog.14014","type":"journal-article","created":{"date-parts":[[2019,6,11]],"date-time":"2019-06-11T00:33:52Z","timestamp":1560213232000},"page":"1613-1618","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Mixed endometrioid and clear cell carcinoma arising from laparoscopic trocar site endometriosis"],"prefix":"10.1111","volume":"45","author":[{"given":"Tetsushi","family":"Tsuruga","sequence":"first","affiliation":[{"name":"Department of Obstetrics and Gynecology, Faculty of Medicine University of Tokyo  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tetsuya","family":"Hirata","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology, Faculty of Medicine University of Tokyo  Tokyo Japan"},{"name":"Department of Obstetrics and Gynecology Doai Kinen Hospital  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ikumi","family":"Akiyama","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology, Faculty of Medicine University of Tokyo  Tokyo Japan"},{"name":"Department of Obstetrics and Gynecology Doai Kinen Hospital  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoko","family":"Matsumoto","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology, Faculty of Medicine University of Tokyo  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Katsutoshi","family":"Oda","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology, Faculty of Medicine University of Tokyo  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tomoyuki","family":"Fujii","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology, Faculty of Medicine University of Tokyo  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yutaka","family":"Osuga","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology, Faculty of Medicine University of Tokyo  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2019,6,10]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41572-018-0008-5"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/nrendo.2013.255"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.amjsurg.2007.07.035"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1186\/s12905-019-0711-8"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ajog.2014.04.011"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1080\/00015458.2010.11680621"},{"key":"e_1_2_7_8_1","first-page":"210","article-title":"Uncommon complications of laparoscopic sterilisation","volume":"72","author":"Denton GW","year":"1990","journal-title":"Ann R Coll Surg Engl"},{"key":"e_1_2_7_9_1","first-page":"962","article-title":"Abdominal wall endometrioma in a laparoscopic trocar tract: A case report","volume":"61","author":"Healy JT","year":"1995","journal-title":"Am Surg"},{"key":"e_1_2_7_10_1","first-page":"523","article-title":"Endometrioma of the trocar site after laparoscopy","volume":"162","author":"Wakefield SE","year":"1996","journal-title":"Eur J Surg"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.1007\/s004649900763"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1097\/00007611-200405000-00024"},{"key":"e_1_2_7_13_1","first-page":"67","article-title":"Endometriosis in a trocar tract: Is it really a rare condition? 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