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46,XY difference of sex development due to isolated 17,20-lyase deficiency

Disease definition

A rare difference of sex development due to reduced 17,20-lyase activity that affects individuals with 46,XY karyotype and is characterized by female or atypical external genitalia with reduced phallic size, hypospadias, incomplete fusion of the labioscrotal swellings, cryptorchidism, and a blind vaginal pouch. Blood pressure and electrolytes are normal whilst hormonal investigations show normal basal and stimulated levels of cortisol, and low basal and stimulated androgen levels.

ORPHA:90796

Classification level: Disorder
  • Synonym(s):
    • 46,XY disorder of sex development due to isolated 17,20-lyase deficiency
  • Prevalence: <1 / 1 000 000
  • Inheritance: Autosomal recessive 
  • Age of onset: Neonatal
  • ICD-10: E29.1
  • ICD-11: LD2A.3
  • OMIM: 202110
  • UMLS: C5681470
  • MeSH: -
  • GARD: -
  • MedDRA: -

  A summary on this disease is available in Español (2018) Italiano (2018) Nederlands (2018) Français (2023)

Additional information

Further information on this disease

Patient-centred resources for this disease

Research activities on this disease

Specialised Social Services

Newborn screening

The documents contained in this web site are presented for information purposes only. The material is in no way intended to replace professional medical care by a qualified specialist and should not be used as a basis for diagnosis or treatment.