[Ring chromosome 21].
D002675:Child, Preschool; D002869:Chromosome Aberrations; D002872:Chromosome Deletion; D002904:Chromosomes, Human, 21-22 and Y; D005260:Female; D006801:Humans; D007223:Infant; D010641:Phenotype; D014314:Trisomy
Ringchromosom 21