Junko Kanno, Akinobu Miura, Sayaka Kawashima, Hirohito Shima, Dai Suzuki, Miki Kamimura, Ikuma Fujiwara, Masayuki Kamimura, Mitsugu Uematsu, Masataka Kudo, Atsuo Kikuchi
49,XXXYY is an extremely rare sex chromosomal aneuploidy (SCA), with only seven cases reported worldwide to date. Among these cases, only three have been documented into adulthood. Moreover, no cases of 49,XXXYY have been reported in Japan. This SCA has been identified in two scenarios: in vitro fertilization and abortion. Similar to 47,XXY, this aneuploidy is a type of Klinefelter syndrome. Aneuploidy of the X chromosome can lead to various progressive complications due to excess X chromosomes. Herein, we present the case of a Japanese man with 49,XXXYY...
April 26, 2024: Endocrine Journal