<unk>  is a genetic condition that is caused by the presence of an isochromosome composed of two copies of the short arm of chromosome 18 in addition to the two normal copies of the chromosome. It is characterized by multiple medical and developmental concerns.
Tetrasomy 18p
Tetrasomy 9p
Monosomy 9p
Distal trisomy 10q
2q37 monosomy
Partial monosomy 13q
Small supernumerary marker chromosome
Chromosome 2q deletion