Variability in Sex Assignment at Birth and Etiological Diagnosis of Differences of Sex Development: A Ten-Year Institutional Experience from Assam.

Introduction: Differences of sex development (DSD) also known as disorders of sex development encompass a wide spectrum of conditions with varying clinical presentations across different age groups. This study aims to analyse various aetiologies of DSD in Assam and the variability of sex assignment at birth.

Methods: This retrospective study included the records of people with DSD presenting to a tertiary centre over 10 years. The age at presentation, sex assignment, gender identity, degree of ambiguity, pertinent hormonal and radiological investigations were noted. Descriptive statistics were used for analysis.

Results: The age of presentation varied widely, with peaks during infancy and puberty. The most prevalent DSD type was 46, XY DSD (61.2%), followed by 46, XX DSD (19.7%) and sex chromosome DSD (19.1%). Among people with 46, XY DSD, androgen biosynthesis disorders were dominant, particularly 5-a reductase 2 deficiency (46.7%). Among 46, XX DSDs, the most common subtype was androgen excess disorders (51.7%) comprising 21a-hydroxylase deficiency (48,3%) and 11β-hydroxylase deficiency (3.4%). Turner syndrome was most prevalent among sex chromosome DSD (71.4%) with others being Klinefelter syndrome, 45, XO/46, XY mixed gonadal dysgenesis and 46, XX/46, XY chimerism. The degree of ambiguity was variable depending on the type of DSD and similarly, sex assignment at birth was influenced by the level of ambiguity.

Conclusion: The study underscores the significance of comprehensive approaches for DSD diagnosis and management, especially in regions with limited resources. The insights gained from this clinical study offer valuable understanding and aid in addressing the complexities associated with these conditions.