The rare syndrome of embryonic testicular regression or agonadism with XY karyotype is described in this paper in a sibship of 7 including 3 cases of regression at a earlier time (in three amenorrheic sisters and on case of tardive and incomplete regression in a brother with bilateral testicular hypotrophy. The antigen H-Y is present in the three sisters. The pathogenesis of this syndrome, compared with that of pure gonadal dysgenesis is discussed.
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