48, XXXX, A Rare Aneuploidy

The 48, XXXX chromosome constitution is a rare aneuploidy which shows some peculiar manifestations in affected females. This first report from India of tetrasomy X with bilateral, typical, complete coloboma of iris, shows the importance of chromosomal investigation and fluorescent in situ hybridization (FISH) in females with mental retardation and dysmorphic features.