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Females have two X chromosomes (XX). Males have an X and a Y (XY). But in rare cases, a male is born with an extra X chromosome (XXY). This is Klinefelter syndrome. It’s also called Klinefelter’s or XXY. The primary features are infertility and small testicles. Often, men don’t even know they have Klinefelter until they run into problems trying to have a child. There’s no cure, but people with the syndrome can lead a regular life. With the right care, most men with Klinefelter lead normal, healthy lives.

It happens because one may have:

  • An extra X chromosome in every cell, which is the most common
  • An extra X chromosome in only some cells, called mosaic Klinefelter, where you don’t get as many symptoms
  • More than one extra X chromosome, which is very rare and more severe


Klinefelter syndrome (KS) also known as 47,XXY or XXY, is the set of symptoms
that result from two or more X chromosomes in males. The primary features are …Directed by Lucía Puenzo. With Ricardo Darín, Valeria Bertuccelli, Germán
Palacios, Carolina Pelleritti. The story of an intersexual fifteen-year-old. She lives
xxyXXY is a 2007 Argentine-Spanish-French drama film written and directed by
Lucía Puenzo. Starring Ricardo Darín, Valeria Bertuccelli, Inés Efron, and Martín
Klinefelter syndrome is a chromosomal condition in boys and men that can affect
physical and intellectual development. Most commonly …A collection of disease information resources and questions answered by our
Genetic and Rare Diseases Information Specialists for 47, XXY. Klinefelter syndrome is a genetic disorder that doesn’t have a cure, but most men
who have it can live normal, healthy lives. Learn the causes …XXY (Klinefelter Syndrome): A Pediatric Quantitative Brain Magnetic Resonance
Imaging Case-Control Study. Jay N. Giedd, Liv S. Clasen, Gregory L. Wallace, …XXY. For just about everybody, adolescence means having to confront a number
of choices and life decisions, but rarely any as monumental as the one facing …XXY occurs in approximately 1 in 650 males and is the most common SCA
among males. Associated physical and medical features include tall stature,
narrow …

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