title: The XXXY variant of Klinefelter's syndrome in a child.
mesh_terms: D000015:Abnormalities, Multiple / Q000209:etiology; D002648:Child; D006801:Humans; D006972:Hypertelorism / Q000209:etiology; D007621:Karyotyping; D007713:Klinefelter Syndrome / Q000175:diagnosis*; D008297:Male; D012730:Sex Chromosomes