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Transvaginal ultrasonography showed a heterogeneous mass of 16 mm in diameter in the left adnexal region. At 3 months after her referral, the asymptomatic left adnexal mass had increased to 55 mm in diameter. Prominent vascular flow was detected in the solid portion by color Doppler ultrasonography. Magnetic resonance imaging showed suspected hemorrhage in the left adnexal cystic mass. Three\u2010dimensional computerized tomographic angiography showed the prominent development of tortuous blood vessels in the left adnexal region, which originated from the left ovarian artery. The patient had a negative \u03b2\u2010human chorionic gonadotropin (hCG) level. Left salpingectomy was performed by a single\u2010port laparoscopic approach. A pathological examination revealed degenerated villous tissue with \u03b2\u2010hCG\u2010positive syncytiotrophoblasts.<\/jats:p>","DOI":"10.1111\/jog.13869","type":"journal-article","created":{"date-parts":[[2018,12,6]],"date-time":"2018-12-06T11:20:30Z","timestamp":1544095230000},"page":"729-733","update-policy":"http:\/\/dx.doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Chronic tubal pregnancy manifesting as a heterogeneous adnexal mass with prominent neovascularization in a woman with a negative serum \u03b2\u2010human chorionic gonadotropin level"],"prefix":"10.1111","volume":"45","author":[{"given":"Kazuhisa","family":"Fujita","sequence":"first","affiliation":[{"name":"Department of Obstetrics and Gynecology Gifu Prefectural Tajimi Hospital  Tajimi Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shohei","family":"Iyoshi","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology Gifu Prefectural Tajimi Hospital  Tajimi Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kazuko","family":"Watanabe","sequence":"additional","affiliation":[{"name":"Department of Pathology Gifu Prefectural Tajimi Hospital  Tajimi Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Akihiro","family":"Takeda","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology Gifu Prefectural Tajimi Hospital  Tajimi Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2018,12,6]]},"reference":[{"key":"e_1_2_5_2_1","first-page":"63","article-title":"Chronic ectopic pregnancy","volume":"59","author":"Cole T","year":"1982","journal-title":"Obstet Gynecol"},{"key":"e_1_2_5_3_1","first-page":"46","article-title":"Chronic ectopic pregnancy. 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