Paeds · endocrinology-diabetes-and-growth
Disorders of sex development
Also known as disorders of sex development · differences of sex development · DSD · atypical genitalia · ambiguous genitalia · intersex disorders (deprecated)
A fellowship approach to disorders of sex development: recognise the atypical-genitalia infant, exclude a salt-wasting adrenal crisis before reaching for a label, classify using the 2006 Chicago framework built from karyotype rather than appearance, confirm with a karyotype and a 17-hydroxyprogesterone first, and deliver care through a multidisciplinary team that defers non-consent cosmetic surgery and protects lifelong psychosocial and gonadal health.
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Red flags
- A virilised 46,XX neonate presenting with vomiting, dehydration, hyponatraemia, hyperkalaemia, and hypoglycaemia at one to three weeks of age has salt-wasting 21-hydroxylase congenital adrenal hyperplasia until proven otherwise — it can kill before the diagnosis is confirmed
- Any infant with non-palpable gonads on examination may have a salt-wasting 46,XX infant with congenital adrenal hyperplasia mistaken for a male — send electrolytes, glucose, and 17-hydroxyprogesterone urgently
- Severe hypospadias with bilateral cryptorchidism is a disorder of sex development until excluded — never discharge the child without a karyotype and a full endocrine work-up
- A phenotypically female infant with inguinal herniae may carry an intra-abdominal testis and partial androgen insensitivity — palpable gonads in a 'female' infant demand investigation
- Never assign a gender of rearing alone, and never perform cosmetic genital surgery without genuine informed consent — both cause measurable lifelong psychological harm
- An adolescent with primary amenorrhoea, normal breast development, and absent uterus may have complete androgen insensitivity syndrome with an intra-abdominal testis carrying a real malignancy risk
- Language wounds: never use the terms 'intersex' or 'hermaphrodite' in front of families — the 2006 Chicago consensus retired them deliberately
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Board mappings
- Endocrinology and growth - recognise and manage disorders of sex development
- Neonatal medicine - evaluate the newborn with atypical genitalia
- Adolescent medicine - puberty and reproductive health
- Endocrinology - investigate and manage disorders of sex development including congenital adrenal hyperplasia and salt-wasting crises
- Neonatal medicine - recognise and stabilise the neonate with ambiguous genitalia and exclude salt-wasting adrenal crisis
- Renewed curriculum for first-year trainees from 2027 - Learning goal 6: Clinical management - essential general paediatrics including ethical decision-making
- Endocrinology and Growth 10-12
- Neonatal Medicine 10-12
- Clinical Applications
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- Short Cases
- 3. Endocrinology and diabetes - Disorders of sex development
- 1. Neonates and infants - congenital anomalies including ambiguous genitalia
- 4. Professional skills and knowledge: Safeguarding and ethical practice
- Foundation of Practice (FOP)
- Theory and Science (TAS)
- Applied Knowledge in Practice (AKP)
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- General Pediatrics Content Outline - D15 Endocrinology (5%)
- General Pediatrics Content Outline - D18 Neonatology (5%)
- General Pediatrics Content Outline - Universal Task 4: Management and Treatment
- Patient Care 4: Clinical Reasoning
- Patient Care 5: Patient Management
- Medical Knowledge 2: Endocrine disorders
- Systems-Based Practice 2: Coordination of care and multidisciplinary teams
- Medical Expert
- Pediatrics: Foundations EPA #8 - Communicating assessment findings and management plans to patients and/or families
- Pediatrics: Endocrinology applied domain
A baby is noted in the delivery room to have ambiguous genitalia — clitoromegaly and fused labia in an infant the midwife recorded as female, or a small phallus with severe hypospadias and impalpable gonads recorded as male. The fellowship task is to see that the appearance is only the surface, that beneath it may sit a metabolic emergency that closes in a fortnight, and that the name you eventually give the family is built from a karyotype and a hormone panel rather than from the external look. The wrong move is to assign a gender on the spot or to reach for a surgical fix before the picture is complete. [1] [4]
Hold the sequence S-I-C-C in your head when the cord is still damp. S — Stabilise the salt-wasting crisis first, because 21-hydroxylase congenital adrenal hyperplasia kills through shock, hyponatraemia, and hyperkalaemia before anyone names it. I — Investigate with a karyotype and a 17-hydroxyprogesterone, the two tests that orient every subsequent decision. C — Classify using the Chicago framework, built from the karyotype, not the appearance. C — Counsel through the multidisciplinary team, because no single clinician assigns gender or consents to surgery. The metabolic threat comes before the label, and the label comes before the gender, and the gender comes before the operating theatre. [2] [5]
Overview & Definition
A newborn whose chromosomal, gonadal, or anatomical sex develops along an atypical path carries what the 2006 Chicago consensus named a disorder of sex development. The term was coined deliberately to retire the older vocabulary of 'intersex' and 'hermaphroditism', words that carried stigma and implied a person wedged between two sexes rather than a child with a specific, nameable, and treatable condition. The Chicago definition is deliberately broad — it captures any infant in whom the chromosomal sex, the gonadal sex, or the anatomical sex is unusual — because the point is to trigger a systematic work-up rather than to settle a label at the bedside. [1] [2]
The clinical importance of this definition is that it points the clinician to the right first question, which is never 'is this a boy or a girl' but 'what is the karyotype, and is there a metabolic emergency hiding behind this appearance'. Congenital adrenal hyperplasia caused by 21-hydroxylase deficiency is the single most common cause of atypical genitalia worldwide, and it is the one that kills through salt-wasting. Every other cause is a long, complex, multidisciplinary story, but the salt-wasting crisis is a two-week clock that starts ticking at birth. [3] [11]
The condition sits at the intersection of endocrinology, genetics, urology, psychology, and ethics, which is why no single clinician owns it. The general paediatrician is the coordinator who stabilises the emergency, initiates the work-up, convenes the multidisciplinary team, counsels the family honestly, and stays with the child through puberty and into adult transition. The lifespan is long, the decisions are consequential, and the evidence on the best time to operate and disclose has shifted decisively toward deferral and honesty over the last two decades. [3] [7]
References12ShowHide
- [1]Hughes IA, Houk C, Ahmed SF, et al. Consensus statement on management of intersex disorders. Arch Dis Child, 2006.PMID 16624884
- [2]Lee PA, Houk CP, Ahmed SF, et al. Consensus statement on management of intersex disorders. International Consensus Conference on Intersex. Pediatrics, 2006.PMID 16882788
- [3]Lee PA, Nordenström A, Houk CP, et al. Global Disorders of Sex Development Update since 2006: Perceptions, Approach and Care. Horm Res Paediatr, 2016.PMID 26820577
- [4]Ahmed SF, Achermann JC, Arlt W, et al. UK guidance on the initial evaluation of an infant or an adolescent with a suspected disorder of sex development. Clin Endocrinol (Oxf), 2011.PMID 21521344
- [5]Ahmed SF, Achermann JC, Arlt W, Balen A, Conway G, Edwards Z, Elford S, Hughes IA, Izatt L, Krone N, Miles HL, O'Toole S, Perry L, Sanders C, Simmonds M, Watt A, Willis D. Society for Endocrinology UK guidance on the initial evaluation of an infant or an adolescent with a suspected disorder of sex development (Revised 2015). Clin Endocrinol (Oxf), 2016.PMID 26270788
- [6]Öçal G Current concepts in disorders of sexual development. J Clin Res Pediatr Endocrinol, 2011.PMID 21911322
- [7]Wisniewski AB, Batista RL, Costa EMF, et al. Management of 46,XY Differences/Disorders of Sex Development (DSD) Throughout Life. Endocr Rev, 2019.PMID 31365064
- [8]Hersmus R, van Bever Y, Wolffenbuttel KP, et al. The biology of germ cell tumors in disorders of sex development. Clin Genet, 2017.PMID 27716895
- [9]Crouch NS, Creighton SM. Minimal surgical intervention in the management of intersex conditions. J Pediatr Endocrinol Metab, 2004.PMID 15645692
- [10]McCann-Crosby B, Mansouri R, Dietrich JE, et al. State of the art review in gonadal dysgenesis: challenges in diagnosis and management. Int J Pediatr Endocrinol, 2014.PMID 24731683
- [11]Speiser PW, Arlt W, Auchus RJ, Baskin LS, Conway GS, Merke DP, Meyer-Bahlburg HF, Miller WL, Murad MH, Oberfield SE, White PC. Congenital Adrenal Hyperplasia Due to Steroid 21-Hydroxylase Deficiency: An Endocrine Society Clinical Practice Guideline. J Clin Endocrinol Metab, 2018.PMID 30272171
- [12]Almasri J, Zaiem F, Rodriguez-Gutierrez R, et al. Genital Reconstructive Surgery in Females With Congenital Adrenal Hyperplasia: A Systematic Review and Meta-Analysis. J Clin Endocrinol Metab, 2018.PMID 30272250