Transvaginal ultrasonographic detection of congenital anomalies in the first trimester

Am J Obstet Gynecol. 1990 Aug;163(2):466-76. doi: 10.1016/0002-9378(90)91177-e.


Transvaginal ultrasonography enables detailed visualization of the first-trimester pregnancy. Thirty-three structural anomalies have been diagnosed in the first trimester of pregnancy during a 2-year study period. An understanding of normal embryonic development is essential before attempting diagnosis in this gestational period.

MeSH terms

  • Congenital Abnormalities / diagnosis*
  • Embryonic and Fetal Development
  • Female
  • Fetal Diseases / diagnosis*
  • Humans
  • Pregnancy
  • Pregnancy Trimester, First
  • Prenatal Diagnosis*
  • Ultrasonography*