|Trisomy 9 mosaic||
Glossaries - Disabilities
Glossaries Description -
An A to Z glossary of disabilities
A rare chromosomal condition where the entire eighth chromosome, known as trisomy, appears three times instead of twice
There are three types of Trisomy 9, Full trisomy 9: All of the cells in the baby's body and placenta have three copies of chromosome 9.Partial trisomy 9: There are two full copies of the ninth chromosome plus an additional partial copy.Mosaic trisomy 9: Trisomy is present in some of the body's cells while other cells have a normal set of chromosomes.
Symptoms include characteristic facial appearance, vision loss, dislocated joints, underdeveloped genitalia, kidney cysts, feeding and breathing difficulties, short stature and development delays.
In most cases, trisomy 9 appears to occur randomly rather than as a result of specific, identified risk factors.
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