A Study of Twin Placentation in Tokyo
- 1 January 1984
- journal article
- research article
- Published by Cambridge University Press (CUP) in Acta geneticae medicae et gemellologiae: twin research
- Vol. 33 (1) , 115-120
- https://doi.org/10.1017/s0001566000007583
Abstract
A total of 178 placentas of twins born in Tokyo in 1961-1982 were examined. Only just over one third were dichorionic, 110 being monochorionic and DZ twins were estimated to account for 24.7% of the pairs. The lower frequency of DZ twinning in Japan is attributed to lower gonadotropin values in Japanese women as compared to European, American, or African women. High fetal morbidity was found in monochorionic twins and this is attributed to a frequent occurrence of vascular anastomoses.Keywords
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