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''Not to be confused with [[XXYY Syndrome]], [[XXXYY Syndrome]], [[XXXYY Syndrome]].''
'''49,XXYYY syndrome''' is a [[intersex]] variation in which a [[CTM]] individual has two extra Y chromosomes and one extra X chromosome. It is a very rare variation amongst [[AMAB|DMAB]] individuals, and it has no estimated rarity.
Those with this variation tend to have facial dysmorphism, mild microcephaly, limitation of supination at the elbows, delayed bone age, and moderate intellectual disability (such as autism.)<ref>[https://pubmed.ncbi.nlm.nih.gov/8330452/]</ref> This variation is often considered a subset or a related variation to [[Klinefelter Syndrome|kilnefelter syndrome]].
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