title: Irregular phenotypic expression of ring chromosomes.
abstract: 2 patients with 13- and C9-rings are reported. On reviewing the phenotypical features of the published ring carriers and comparing them with our results we do not find any characteristic similarities. This can be explained by cytogenetical and biological findings. We are therefore inclined to reject the existence of clear-cut ring chromosome syndromes.
mesh_terms: D002648:Child; D002675:Child, Preschool; D002869:Chromosome Aberrations; D002901:Chromosomes, Human, 13-15; D002906:Chromosomes, Human, 6-12 and X; D003582:Cytogenetics; D005260:Female; D006801:Humans; D008297:Male; D010641:Phenotype