The casee presented here may be the first fully identified and verified cas of translocation 4p-- syndrome, a B4/G22 translocation, ie, 45,XX,-4,-22,+t(4q 22q). Thirty-nine other cases of the 4p--syndrome, including one other possible translocation case, have been found in the medical literature. Conventional chromosome studies cannot distinguish between 4p-- (Wolf) syndrome and 5p-- (cri-du-chat) syndrome, and the clinical features, as in our case, may not be sufficiently characteristic to permit differentiation. The newer chromosome banding techniques have made specific identification possible.
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