title: Ultrasound manifestations of unusual trisomies-excluding trisomy 13, 18, and 21: a literature review.
abstract: Trisomy is the most commonly identified chromosome abnormality, occurring in at least 4% of all clinically recognized pregnancies (1). Most of the trisomies are associated with a single additional chromosome, although 2 other types of trisomic conceptions are occasionally observed, those with 2 additional chromosomes or double trisomy and those with both a normal and trisomic cell line or mosaic trisomies. The adverse effects of trisomy on the phenotype are well established. In this review article, we consider the prevalence of the unusual trisomies (excluding 13, 18, and 21) and present a review of their ultrasound findings.
authors.affiliation: Department of Radiology, University of Washington Medical Center, Seattle, WA 98195, USA. dighe@u.washington.edu
authors.forename: Manjiri
authors.initials: M
authors.lastname: Dighe
authors.forename: Edith
authors.initials: E
authors.lastname: Cheng
authors.forename: Theodore
authors.initials: T
authors.lastname: Dubinsky
mesh_terms: D000015:Abnormalities, Multiple / Q000000981:diagnostic imaging* / Q000453:epidemiology / Q000235:genetics*; D025063:Chromosome Disorders / Q000000981:diagnostic imaging* / Q000453:epidemiology / Q000235:genetics*; D006801:Humans; D014314:Trisomy / Q000235:genetics*; D014463:Ultrasonography / Q000379:methods*