[Association of mixed gonadal dysgenesis and non-classic 21-hydroxylase deficiency].
BACKGROUND
The rare association of mixed gonadal dysgenesis and non classical congenital hyperplasia by 21-hydroxylase deficiency poses the problem of their respective responsibility in the development of sexual ambiguity.


METHODS
In a newborn with ambiguous genitalia, blood 17-OH progesterone was moderately elevated (3.9 to 14.1 ng/mL) leading to the diagnosis of non-classical 21 hydroxylase deficiency, Molecular studies later confirmed this diagnosis. However, the presence of a palpable gonad and the karyotype (45 X/46 XY mosaicism) indicated a mixed gonadal dysgenesis as the cause of sexual ambiguity. Histological examination revealed the presence of a testis and a streak gonad.


CONCLUSIONS
This observation emphasizes the need for a complete clinical and biological analysis in all newborns with sexual ambiguity.
Del Pino
O
O
Service d'endocrinologie pédiatrique, hôpital Saint-Vincent-de-Paul, Paris, France.
Carel
J C
JC
Barbet
J P
JP
Morel
Y
Y
Chaussain
J L
JL
D019326:17-alpha-Hydroxyprogesterone / Q000097:blood; D000312:Adrenal Hyperplasia, Congenital; D005260:Female; D006060:Gonadal Dysgenesis, Mixed / Q000097:blood / Q000150:complications*; D006801:Humans; D007231:Infant, Newborn
D019326:17-alpha-Hydroxyprogesterone