Contrary to what is observed in true hermaphroditism and in male 
pseudo-hermaphroditism, there is no erroneous transmission of the genetic 
gonadal differentiation programme in female pseudohermaphroditism. All that has 
happened is virilization of the urogenital sinus and external genitalia in a 
foetus exposed to exo- or endogenous androgens. In the absence of testis there 
is no production of anti-mullerian hormone, and for these reasons the uterus, 
the fallopian tubes and the vagina develop normally, whilst the wollfian ducts 
are regressed and there is no trace of male deep spermatic pathway. On the basis 
of recent acquisitions in biochemistry, endocrinology and embryogenesis, the 
authors compare the various degrees of virilization with the biochemical 
abnormalities.