Tetrasomy 9p

Tetrasomy 9p is a rare genetic disease where the short arm of chromosome 9 (9p) appears not just twice in a base pair, but four times. The additional chromosome is called a “marker” or an isochromosome. It is considered a mosaic condition.

• Chromosome 9, Tetrasomy 9p
• Mosaic Tetrasomy 9p Case with the Phenotype Mimicking Klinefelter Syndrome

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