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Laboratory data showed slight elevation of CA125 and no other abnormal findings and magnetic resonance imaging revealed a circumscribed margin mass in the uterine fundus. We diagnosed the mass as benign leiomyoma and performed total laparoscopic hysterectomy. Postoperative pathological examination revealed TTM of synovial sarcoma within the uterine leiomyoma. A database search identified 29 cases of TTM within uterine leiomyoma. The donor tumor was mostly breast cancer (in 23 cases). To the best of our knowledge, this is the first report of a sarcoma TTM to a uterine leiomyoma. Despite the difficulty of preoperative diagnosis, TTM should be considered during the treatment approach for a patient with leiomyoma and a history of malignant tumors.<\/jats:p>","DOI":"10.1111\/jog.14298","type":"journal-article","created":{"date-parts":[[2020,5,26]],"date-time":"2020-05-26T01:00:50Z","timestamp":1590454850000},"page":"1216-1223","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Unexpected tumor\u2010to\u2010tumor metastasis of synovial sarcoma within leiomyoma: A case report and literature review"],"prefix":"10.1111","volume":"46","author":[{"given":"Shiho","family":"Sakai","sequence":"first","affiliation":[{"name":"Department of Obstetrics and Gynecology Kyoto Prefectural University of Medicine  Kyoto Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yukiko","family":"Morinaga","sequence":"additional","affiliation":[{"name":"Department of Surgical Pathology Kyoto Prefectural University of Medicine  Kyoto Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Akemi","family":"Koshiba","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology Kyoto Prefectural University of Medicine  Kyoto Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Taisuke","family":"Mori","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology Kyoto Prefectural University of Medicine  Kyoto Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Izumi","family":"Kusuki","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology Kyoto Prefectural University of Medicine  Kyoto Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jo","family":"Kitawaki","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology Kyoto Prefectural University of Medicine  Kyoto Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2020,5,25]]},"reference":[{"key":"e_1_2_4_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/1097-0142(196809)22:3<635::AID-CNCR2820220320>3.0.CO;2-O"},{"key":"e_1_2_4_3_1","doi-asserted-by":"publisher","DOI":"10.1177\/106689690301100214"},{"key":"e_1_2_4_4_1","first-page":"367","article-title":"Tumor\u2010to\u2010tumor metastasis: Pathology and neuroimaging considerations","volume":"5","author":"Moody P","year":"2012","journal-title":"Int J Clin Exp Pathol"},{"key":"e_1_2_4_5_1","first-page":"427","article-title":"Extra genital metastases to the uterus","volume":"111","author":"Weingold AB","year":"1961","journal-title":"Am J Obstet Gynecol"},{"key":"e_1_2_4_6_1","first-page":"229","article-title":"Mammary carcinoma metastasis to uterine Myoma","volume":"23","author":"Birdsall CJ","year":"1964","journal-title":"Obstet Gynecol"},{"key":"e_1_2_4_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/0002-9378(71)90789-7"},{"key":"e_1_2_4_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1440-1827.1979.tb00960.x"},{"key":"e_1_2_4_9_1","first-page":"285","article-title":"Breast cancer metastatic to uterine leiomyoma","volume":"76","author":"Spiro RK","year":"1979","journal-title":"J Med Soc N J"},{"key":"e_1_2_4_10_1","first-page":"104","article-title":"Multiple uterine leiomyoma with metastasis of an occult pulmonary carcinoma (a case report)","volume":"35","author":"Shroff CP","year":"1989","journal-title":"J Postgrad Med"},{"key":"e_1_2_4_11_1","first-page":"476","article-title":"Extragenital metastasis to uterine leiomyomata. 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