Editor-In-Chief: C. Michael Gibson, M.S., M.D. 
Synonyms and keywords:
Trisomy 9 is a chromosomal disorder caused by having three copies (trisomy) of chromosome number 9. It can appear with or without mosaicism.
Symptoms vary, but usually result in dysmorphisms in the skull, nervous system, and mental retardation. Dysmorphisms in the heart, kidneys, and musculoskeletal system may also occur.
Trisomy 9 can be detected prenatally with chorionic villus sampling and cordocentesis, and can be suggested by obstetric ultrasonography.
Because trisomy 9 may appear with mosaicism, it is suggested that doctors take samples from multiple tissues when karyotyping for diagnosis.
- ↑ Stipoljev F, Kos M, Kos M, Miskovi B, Matijevic R, Hafner T, Kurjak A (2003). "Antenatal detection of mosaic trisomy 9 by ultrasound: a case report and literature review". J Matern Fetal Neonatal Med 14 (1): 65-9. PMID 14563095.
|Pathology: chromosome abnormalities (Q90-Q99, 758)|
|Autosomal trisomies||Down syndrome (21), Edwards syndrome (18), Patau syndrome (13), Trisomy 9, Warkany syndrome 2 (8), Cat eye syndrome (22), Trisomy 22, Trisomy 16|
|Autosomal monosomies/deletions||Wolf-Hirschhorn syndrome (4), Cri du chat (5), Angelman syndrome/Prader-Willi syndrome (15), |
Miller-Dieker syndrome/Smith-Magenis syndrome (17), 22q11.2 deletion syndrome (22)
|X/Y linked||Monosomy: Turner syndrome (XO)|
Trisomy: Triple X syndrome (XXX), Klinefelter's syndrome (XXY), XYY,
Other Karyotypes: XXXX, XXYY, XXXXX, XXXXY
|Translocations||Philadelphia chromosome, Burkitt's lymphoma|
|Other||Fragile X syndrome, Gonadal dysgenesis (Mixed gonadal dysgenesis)|