An additional case of Smith-Lemli-Opitz syndrome in a 46,XY infant with female external genitalia.

Ambiguity of the external genitalia has been frequently documented in male patients classified as the Smith-Lemli-Opitz (SLO) syndrome. Four previous case reports suggest that in extreme cases of the SLO syndrome there may be complete lack of development of the male external genitalia even in the presence of a normal male 46,XY karyotype. We present an additional case of a phenotypically female infant with dysmorphic features compatible with SLO syndrome and a 46,XY chromosome complement.