Trisomy 9 Classification and external resources
Chromosome 9
ICD-10	Q92.
ICD-9	758
DiseasesDB	32657
MeSH	D014314

See also: Tetrasomy 9p

Trisomy 9 is a chromosomal disorder caused by having three copies (trisomy) of chromosome number 9. It can appear with or without mosaicism.

Symptoms

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.

Detection

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.¹

References

1. ^ 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. doi:10.1080/713605935. PMID 14563095. 

External links

• NORD - National Organization for Rare Disorders, Inc. Chromosome 9, Trisomy 9p (Multiple Variants)
• NORD - National Organization for Rare Disorders, Inc. Chromosome 9, Trisomy Mosaic
• MaggiBlair.com Maggi Blair - Trisomy 9 Mosaic Syndrome

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