Discordant gonadal hypogenesis in apparently MZ twins

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Abstract
SUMMARY: A case of probably MZ twin girls is reported, one of which presenting a serious gonadal hypoplasia, macroschelia and a number of slight malformations, while the other appeared perfectly normal. Both twins presented positive sex-chromatine and a normal karyotype, i. e. 44 A + XX.After a review of twin cases of the « rudimentary gonad syndrome » — which may differ as to its origin, according to the various cases — the present case, the anomalies exhibited by one of the twins are probably the result of the action of a number of noxae, in the course of embryological or fetal life.