Rare chromosomal anomaly

Trisomy 8 mosaicism (also called Mosaic Trisomy 8 or Warkany syndrome 2) is a rare chromosomal condition where some cells in the body have three copies of chromosome 8 instead of the usual two. The word 'mosaic' means that not every cell is affected — some cells have the normal two copies, while others have the extra copy. This mix of normal and abnormal cells is what makes this condition different from full trisomy 8, which is almost always fatal before birth. The condition affects many parts of the body. Common features include intellectual disability (ranging from mild to moderate), delayed development, distinctive facial features, and problems with the skeleton such as extra ribs or fused bones in the spine. Many people also have deep creases on the palms and soles of their feet, which is a well-known clue for diagnosis. Heart defects, kidney problems, and eye abnormalities can also occur. Treatment focuses on managing individual symptoms rather than correcting the underlying chromosomal change. Early intervention programs, physical therapy, speech therapy, and special education support can make a meaningful difference in quality of life. Regular monitoring by a team of specialists is important because the condition can affect many organ systems.

Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.

Bring these to your next appointment

• Q1.Which organs are affected in my child's case, and how severe is the involvement?,What percentage of cells carry the extra chromosome 8, and does that predict how severe the symptoms will be?,What specialists should be part of my child's care team, and how often should we see each one?,What early intervention therapies are most important to start right away?,Are there any heart or kidney problems we need to monitor or treat urgently?,What educational supports should we request for school?,Is there a risk of this condition recurring in future pregnancies?

Common questions about Rare chromosomal anomaly