Prenatal diagnosis of mosaic ring 22 duplication/deletion with terminal 22q13 deletion due to abnormal first trimester screening and choroid plexus cyst detected on ultrasound

J Obstet Gynaecol Res. 2009 Oct;35(5):978-82. doi: 10.1111/j.1447-0756.2009.01040.x.

Abstract

We report a rare case of mosaic ring chromosome 22 duplication/deletion in a fetus for whom karyotype analysis was required because of an abnormal finding in the maternal serum screening test and a choroid plexus cyst detected on prenatal ultrasound. Additional prenatal study of the amniotic fluid by fluorescence in situ hybridization was performed and the terminal 22q13.3 deletion was detected on ring chromosome. The final karyotype was 45,XX,-22[3]/46,XX,r(22)(p11q13.2)[63]/46,XX,idicr(22)(p11q13.2;p11q13.2)[2]dn.ishder(22)(N25+, ARSA-, ter-). The pegnancy was terminated. Cytogenetic analysis of the intracardiac blood also revealed ring 22 mosaicism with only one metaphase spread with idicr(22) as the unstable isodicentric rings are subsequently lost from most cells. We discuss the prenatal diagnosis of this rare condition.

Publication types

  • Case Reports

MeSH terms

  • Abortion, Induced
  • Central Nervous System Cysts / diagnostic imaging*
  • Central Nervous System Cysts / genetics
  • Choroid Plexus / diagnostic imaging*
  • Choroid Plexus Neoplasms / diagnostic imaging*
  • Choroid Plexus Neoplasms / genetics
  • Chromosome Deletion*
  • Chromosomes, Human, Pair 22*
  • Female
  • Genetic Testing
  • Humans
  • In Situ Hybridization, Fluorescence
  • Karyotyping
  • Mosaicism*
  • Pregnancy
  • Pregnancy Trimester, First / genetics
  • Prenatal Diagnosis
  • Ring Chromosomes*
  • Ultrasonography, Prenatal