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Mentalretardation (MR)affectsapproximately 3%ofthepopulation Ininfancyandearlychildhood ,mentalretardationoftenpresentsasdevelopmentaldelay UnexplainedMRisresponsibleformorethanhalfofallcases 1,2 Thereissomeevidencethatsubtlechromosomalrearrangementsinv
Mental retardation (MR) affectsapproximately 3% of thepopulation Ininfancyandearlychildhood, mental retardationoftenpresentsasdevelopmentaldelay UnexplainedMRisresponsibleformorethanhalfofallcases 1,2 Thereissomeevidencethatsubtlechromosomalrearrangementsinv