<unk> X syndrome (also called pentasomy X or<unk>  is the presence of three additional X chromosomes. Diagnosis is done by karyotyping. Approximately 25 females have been described in medical literature worldwide with this extremely rare condition. The condition was first described in 1963.
49, XXXXX
48, XXXX
48, XXYY
Trisomy 16
Tris
Trisomy 22
Trisomy 9
XX gonadal dysgenesis