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Il problema degli annessi nelle gravidanze gemellari*

Published online by Cambridge University Press:  01 August 2014

L. Gedda  and
G. Brenci
L. Gedda
Affiliation:
Istituto di Genetica Medica dell'Università di Roma
G. Brenci
Affiliation:
Istituto di Genetica Medica dell'Università di Roma

Summary

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The Authors have investigated the problem of foetal membranes in monozygotic and dizygotic twin pregnancies. The material consisted of anamnestic information derived from the twin case files of Rome's Mendel Institute.

In a sizable number of twin cases (3, 107) it was possible to establish zygosity and the various frequencies of monochorionic or dichorial single or double placenta.

Statistical analysis of this material shows that the frequency of monozygotic twin pregnancies with one placenta and one chorion is 68.35%, while 31.65% have two placentae and two choria. On the other hand, 83.29% of dizygotic twin pregnancies have two placentae and two choria, while 16.71% have one placenta and one chorion.

These figures exceed the material's margin of error, calculated on the basis of an appropriate index. Some case, diagnosed as bichorial with one placenta, are explained as due to two placentae fused into one piece, causing a mistaken diagnosis at birth.

Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 12 , Issue 1 , January 1963 , pp. 1 - 8
Copyright
Copyright © The International Society for Twin Studies 1963

Footnotes

*

Lavoro in omaggio al 70° genetliaco del Prof. Walter W. Williams, Direttore del'International Journal of Fertility.

References

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