Progeny of XY females

[Kevin O'Donnell]

The sex tests routinely carried out on athletes occasionally throw up an
example of a woman with a normal female phenotype but with an XY
karyotype.  I assume that the Y chromosome is defective due to 
mutations in one or more important maleness-determining genes.  If such 
women are fertile (and I assume that this is the case), this means that the 
progeny could have one of four possible karyotypes:
XX - female
XY - male
XY' - female (with 'defective' Y chromosome from the mother)

and YY'.  

My question is this - would the YY' offspring be viable - or is the loss of 
the X chromosome genes too devastating to supprot even foetal growth?