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There are very few reported cases of the clinical course of exaggerated placental site, and a case of a placental polyp arising from an exaggerated placental site has not been reported previously. Here, we report a case of a 43-year-old woman whose chief complaint was of massive genital bleeding. She had undergone an operation for induced abortion in the first trimester 41 days previously. A placental polyp measuring 45 mm with an abundant blood flow could be detected by transvaginal color Doppler ultrasonography and enhanced magnetic resonance imaging. We performed a transabdominal simple total hysterectomy. At the anterior wall of the uterus, a protruding lesion into the uterine cavity was observed and a placental polyp was attached to the protruding lesion. The histological specimen of the protruding lesion, which was considered to be the implantation site, showed intermediate trophoblastic cells infiltrated into the myometrium. An exaggerated placental site was diagnosed, which might lead to a placental polyp. © 2011 The Authors. Journal of Obstetrics and Gynaecology Research © 2011 Japan Society of Obstetrics and Gynecology.


Naoya Harada, Ichiro Nobuhara, Noriko Haruta, Megumi Kajimoto. A placental polyp arising from an exaggerated placental site. The journal of obstetrics and gynaecology research. 2011 Aug;37(8):1154-7

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PMID: 21501326

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