<unk>  (also known as Alfi's Syndrome or simply<unk> -) is a rare chromosomal disorder in which some DNA is missing or has been deleted on the short arm region, “p”, of one of the 9th Chromosomes <unk> 22.2-p23). This deletion either happens de novo or a result of a parent having the chromosome abnormality. This rare chromosome abnormality is often diagnosed after birth when development delay, irregular facial features, and structural irregularities within the heart, and genital defects are noticed. Treatments for this syndrome usually focus on fixing the common malformations associated with this syndrome. Chromosome<unk>  deletion syndrome was first discovered in 1973 when 3 infants with similar clinical features were observed to have a partial deletion of the short arm of Chromosome 9. Symptoms include microgenitalia, intellectual disability with microcephaly and dysmorphic features.
Monosomy 9p
Tetrasomy 9p
Tetrasomy 18p
Distal trisomy 10q
2q37 monosomy
Partial monosomy 13q
Small supernumerary marker chromosome
Xp11.2 duplication