Chromosome 9p deletion syndrome occurs 1 in 50,000 births. Half of the cases occur sporadically, while the other half of cases result from parent translocations or the parent having deletion as well.
Monosomy 9p
Tetrasomy 9p
Tetrasomy 18p
Distal trisomy 10q
2q37 monosomy
Partial monosomy 13q
Small supernumerary marker chromosome
Xp11.2 duplication