A<unk>  is a<unk>  caused by a chromosomal deletion smaller than 5 million base pairs (5 Mb) spanning several genes that is too small to be detected by conventional cytogenetic methods or high resolution karyotyping (2–5 Mb). Detection is done by fluorescence in situ hybridization (FISH). Larger chromosomal deletion<unk> s are detectable using karyotyping techniques.
Microdeletion syndrome
Chromosomal deletion syndrome
Ayazi syndrome
Chromosome 5q deletion syndrome
Marshall–Smith syndrome
Ring chromosome 14 syndrome
22q11.2 duplication syndrome
17q12 microdeletion syndrome