Trisomy 18 mosaicism: A rare genetic chromosomal syndrome where the child has an extra third copy of chromosome 18 in only some of the body's cells. It is a less severe form of Edwards syndrome - the most severe form involves and extra copy of chromosome 18 in all of the body's cells. The severity of the condition is highly variable depending on how many of the body's cells are involved. More detailed information about the symptoms, causes, and treatments of Trisomy 18 mosaicism is available below.
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Prognosis for Trisomy 18 mosaicism: The prognosis varies depending on the nature and severity of symptoms present in individual cases. Roughly half of the patients die during early infancy. Survival into the teens does occur but patients often have severe health problems.
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Ophanet, a consortium of European partners,
currently defines a condition rare when it affects 1 person per 2,000.
They list Trisomy 18 mosaicism as a "rare disease".
Source - Orphanet
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