title: Mosaicism for an extra small ring chromosome.
abstract: A new case for mosaicism for an extra small ring chromosome is described in a 13-year-old girl with minimal phenotype anomalies and moderate mental retardation. The origin of the extra chromosome could not be determined either cytogenetically or clinically. The present case is compared with six similar cases in the literature.
mesh_terms: D000293:Adolescent; D002869:Chromosome Aberrations; D002871:Chromosome Banding; D025063:Chromosome Disorders; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics; D009030:Mosaicism