A review of the literature reporting Klinefelter's syndrome and its chromosomal variations revealed 18 cases of proximal radioulnar synostosis (RUS). The finding of proximal RUS in a single generation is suggestive of a sex chromosome abnormality.
Jancu J. Radioulnar Synostosis: A Common Occurrence in Sex Chromosomal Abnormalities. Am J Dis Child. 1971;122(1):10–11. doi:10.1001/archpedi.1971.02110010046003
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