Assessment of the implantation site by transvaginal ultrasonography.
OBJECTIVE
To investigate the implantation site in a singleton pregnancy.


METHODS
Transvaginal ultrasonography (US) was performed at the mid or late follicular phase and/or at very early gestation before 6 weeks.


METHODS
Ultrasound monitoring was performed on 21 women with spontaneous cycles or treated by administration of 2.5 mg/d bromocriptine mesylate (Parlodel; Sando Co., Tokyo, Japan) for occulted hyperprolactinemia at the Fertility Clinic of the Department of Obstetrics and Gynecology at Gunma University Hospital.


METHODS
The site of the ovary with a growing follicle and/or a corpus luteum of pregnancy, and the location of a gestational sac in longitudinal and transverse views were observed.


RESULTS
When ovulation occurred in the right ovary, 12 of the 14 gestational sacs were located on the right wall, 1 on the midwall, and 1 on the left wall. Ovulation in the left ovary resulted in 5 gestational sacs located in the left wall and 2 on the midwall. That is, of 21 gestational sacs, 17 were located on the ipsilateral uterine wall to the ovulating ovary, 3 on the midwall, and only 1 on the contralateral.


CONCLUSIONS
Implantation occurs on the ipsilateral uterine wall to the ovulating ovary.
Kawakami
Y
Y
Department of Obstetrics and Gynecology, Gunma University School of Medicine, Maebashi, Japan.
Andoh
K
K
Mizunuma
H
H
Yamada
K
K
Itoh
M
M
Ibuki
Y
Y
D000328:Adult; D001971:Bromocriptine / Q000627:therapeutic use; D010064:Embryo Implantation; D005260:Female; D005865:Gestational Age; D006801:Humans; D006966:Hyperprolactinemia / Q000188:drug therapy; D007247:Infertility, Female / Q000188:drug therapy / Q000209:etiology; D008597:Menstrual Cycle; D006080:Ovarian Follicle / Q000000981:diagnostic imaging*; D010060:Ovulation; D011247:Pregnancy; D014463:Ultrasonography; D014599:Uterus / Q000000981:diagnostic imaging*; D014621:Vagina
D001971:Bromocriptine