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From the journal of urology:

Successful Fertility Treatment for Klinefelter's Syndrome
Ranjith Ramasamy, Joseph A. Ricci, Gianpiero D. Palermo, Lucinda Veeck Gosden, Zev Rosenwaks, Peter N. Schlegel

Microdissection testicular sperm extraction is an effective sperm retrieval technique in men with Klinefelter's syndrome. Men with hypogonadism who respond to medical therapy may have a better chance of sperm retrieval.