Differences of sex development

Differences of sex development (DSD) represent a group of congenital conditions that affect human sex development and maturation owing to discrepancies of chromosomal, gonadal and phenotypic sex. The Chicago consensus classifies DSD as sex chromosome DSD, 46,XY DSD and 46,XX DSD, with subclassifications according to gonadal determination into testes and ovaries and hormone-dependent differentiation of Müllerian and Wolffian embryonic structures into female-typical or male-typical internal and external sex organs. DSD may occur as an isolated condition or as part of a complex syndrome. Diagnosis is based on clinical characteristics, imaging studies, hormonal measurements and genetic investigations. Management includes lifelong psychosocial support, hormonal treatments and surgical interventions that require personalization for each case as DSD encompasses a wide variety of aetiologies and presentations. This personalization must also consider individual values and preferences to ensure that clinical care is tailored to meet the unique needs and circumstances of each person, ideally provided by a care team with diverse specialities. This care involves psycho-educational counselling on the condition and its consequences, considering family and cultural norms. Additional efforts are needed to bridge gaps in knowledge related to diagnosis, management and long-term outcomes. Enhancing our understanding of the distinctions between sex and gender in societies is essential as greater awareness will inform and enrich public debates.