A child developed a bronchiolitis-like illness and was found to have mosaic Down's syndrome (diagnosed on karyotype) and also cystic fibrosis, diagnosed on the basis of a high sweat osmolality (247 mosmoles/kg sweat; normal, 62-137) and a homozygous delta F508 genotype. Despite two potentially life-threatening conditions, the child is doing well at the age of 7 years, despite pancreatic insufficiency.
Copyright 2001 Wiley-Liss, Inc.