Other Known Aliases – 47XXY, Klinefelter-Reifenstein-Albright Syndrome
Definition – Genetic condition resulting from two (or more) X chromosomes in a male patient. It is the most common sex chromosome abnormality causing hypogonadism.
Clinical Significance – This condition affects 1 in 500-1000 newborn males in the United States. Symptoms can range from subtle (sometimes not even noticed) to severe learning, developmental, and cognitive deficiencies. The most prominent features are sterility, small testes, taller stature, less androgenic body hair, and gynecomastia. Due to these developmental abnormalities, it is often not diagnosed until after puberty
History – Named after Harry Fitch Klinefelter, Jr. (1912-1990), an American rheumatologist and endocrinologist, who earned is medical doctorate from Johns Hopkins University. He worked in the prestigious clinic of Dr. Fuller Albright at Massachusetts General Hospital where he studied a group of nine boys who all had similar features of gynecomastia, aspermatogenesis, and increased follicle-stimulating hormone. He credits Dr. Albright with this discovery, as it was his clinic and he first noticed the pattern, but Albright wanted Klinefelter to do the research work on it as a new fellow attending. The group (with Dr. Edward Reifenstein) published this cases series in 1942 and Dr. Albright insisted that Klinefelter take lead authorship.
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