XXXXY syndrome

Uncommon card · No. 90942

XXXXY syndrome, also known as 49,XXXXY syndrome or Fraccaro syndrome, is an extremely rare aneuploidic sex chromosomal abnormality. It occurs in approximately 1 out of 85,000 to 100,000 males. This syndrome is the result of maternal non-disjunction during both meiosis I and II. It was first diagnosed in 1960 and was named Fraccaro syndrome after the researcher.

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