INTRODUCTION
YY syndrome occurs as a result of one or more additional
Y chromosomes. Affected males have karyotype 47XYY
or 48XYYY rather than the typical 46XY.
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ANTENATAL
Cases of YY syndrome have no distinguishing features
on ultrasound
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POSTNATAL
Many affected males are clinically undetected as
this syndrome presents with only subtle features.
Individuals have normal birthweights but exhibit
increased growth in childhood resulting in tall statures
with disproportionately long legs. Some individual
may be affected by hypogonadism and infertility but
most have normal genitals, hormone levels and fertility.
Mean IQ is lower and some association with high aggression
and compulsive behaviour have been reported.
Individuals with karyotypes 48XYYY have more pronounced
mental retardation and tall stature.
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WEST MIDLANDS
DATA
To be added
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