Forensic Medicine & Endocrinology: Intersex (DSD)
Understanding Variations in Sex Development
The term “intersex” is now clinically referred to as Differences or Disorders of Sex Development (DSD). These are congenital conditions where the development of chromosomal, gonadal, or anatomical sex is atypical.
1. Categorization (Classification)
| Category | Examples/Features |
|---|---|
| Sex Chromosome DSD | Turner Syndrome (45, X), Klinefelter Syndrome (47, XXY), Ovotesticular DSD. |
| 46, XY DSD | Androgen Insensitivity Syndrome (AIS), 5α-reductase deficiency. |
| 46, XX DSD | Congenital Adrenal Hyperplasia (CAH). |
2. NEET PG High-Yield Pearls
- Androgen Insensitivity Syndrome (AIS): Genetically male (46, XY), but phenotypically female due to absent/defective androgen receptors. They have testes (often undescended) and no uterus/ovaries.
- Congenital Adrenal Hyperplasia (CAH): Most common cause of ambiguous genitalia in 46, XX individuals. Due to 21-hydroxylase deficiency (cortisol/aldosterone deficiency + excess androgens).
- 5α-Reductase Deficiency: Individuals are born with ambiguous genitalia, but virilization occurs at puberty (high testosterone sensitivity).
- Forensic Significance: Identification in DSD cases involves a multidisciplinary team (pediatric endocrinologist, geneticist, and psychologist). Legal recognition of sex is a complex issue and varies by jurisdiction.