Undetected Klinefelter's syndrome as a cause of azoospermia.
D000328:Adult; D003878:Dermatoglyphics; D006801:Humans; D007248:Infertility, Male / Q000209:etiology*; D007621:Karyotyping; D007713:Klinefelter Syndrome / Q000150:complications* / Q000175:diagnosis; D008297:Male; D008875:Middle Aged; D012728:Sex Chromatin; D013094:Spermatozoa