<unk>  is exceptionally rare. Only twelve cases have been reported in the medical literature, in addition to four mosaic cases. As the related<unk>  is much more common and has a mild to asymptomatic phenotype, it is speculated that there may be many undiagnosed cases of<unk>  that are milder than those medically reported.
XYYY syndrome
XYYYY syndrome
XYY syndrome
XXYY syndrome
XX male syndrome
XXXY syndrome
Turner syndrome
Klinefelter syndrome