Clinical outcome specific to each chromosome
Predicting the clinical presentation of chromosomal mosaic individuals is very difficult. In this section, we have tried to summarize what is known about the effects of mosaicism for each chromosome. Looking at published case reports, there is often a broad range of clinical outcomes reported, even when the same chromosome is involved. It is important to recognize that the cases that are published may not accurately reflect the frequency of possible outcomes. There is generally a tendency to publish cases with the worst outcomes or unusual presentations, thus neglecting the less severe, more ordinary and often more frequent outcomes. Since there is little systematic data about clinical outcome, this section can only be considered a guide to patients and families. This section is reliant on our own judgment and interpretations of the data rather than proven facts.
It is not our intention to encourage patients and families to try to predict their own outcome. We encourage you to browse the whole web site to gain an understanding of how chromosomal mosaicism occurs and why there is so much variability in expression of these conditions. We hope that you use this section to get an idea of the kind of health conditions certain individuals diagnosed with chromosomal mosaicism have experienced.
The contents of this section
For each chromosome we will review some of the relevant cases reports in the literature, discuss the occurrence of confined placental mosaicism and the potential implications of uniparental disomy. We will mention concerns that may arise in prenatal diagnosis. This section is more medically focused and may provide detailed information and medical terminology which is not aimed at the general public.
All pages provide links to information and support groups relevant to each specific chromosome. A list of references is provided at the bottom of each page with links to the abstracts in PubMed for more details on the case reports and studies cited.
As you are browsing through this section it is important to remember that the great majority of pregnancies with chromosomal mosaicism detected on chorionic villus sampling proceed uneventfully and result in normal live born infants.
Select the chromosome you are interest in from the grid of numbers on the left side of the page.