Polysomy X masquerading as Down's syndrome: the necessity of being earnest about karyotype analysis in the diagnosis of mongolism.
D002875:Chromosomes; D003937:Diagnosis, Differential; D004314:Down Syndrome / Q000175:diagnosis* / Q000235:genetics; D006801:Humans; D007223:Infant; D008297:Male; D012729:Sex Chromosome Aberrations / Q000175:diagnosis* / Q000235:genetics