Abstract

Macro- and microscopic changes in a spontaneous abortus at 7 weeks of menstrual age are described in which a karyotype 47,XY,B5+was found. There were hypoplasia of amniotic cavity, abnormal connection of amnion to the embryo body, disturbed topographic position of the embryo in the embryo membrane, lack of internal organ rudiments, hypoplasiy of the allantoid stalk and of chorion frondosum. Phenotypical disturbances in abortuses with trisomy B described in the literature were analyzed.

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