title: Sonoembryology by three-dimensional ultrasonography: pictorial essay.
abstract: BACKGROUND
  Three-dimensional ultrasonography in obstetrics has evolved in the last years, and nowadays it is a methodology that greatly helps prenatal diagnosis. Through its rendering mode it allows the careful evaluation of fetal face and limbs, and in multiplanar mode it allows the assessment of the anatomy through the many possible planes. In the first trimester of gestation, three-dimensional ultrasonography permits the detailed evaluation of embryonic development. Its main advantages over two-dimensional ultrasonography are shorter examination time and the possibility of storage of the volumes for later processing and analysis.
  
  
  OBJECTIVE
  We present a pictorial essay with normal embryo development in the first trimester of pregnancy by three-dimensional ultrasonography, from the fifth to ninth week.
authors: Sebastiao Marques
authors: SM
authors: Zanforlin Filho
authors: Edward
authors: E
authors: Araujo Júnior
authors: Helio Antonio
authors: HA
authors: Guiarães Filho
authors: Claudio Rodrigues
authors: CR
authors: Pires
authors: Luciano Marcondes Machado
authors: LM
authors: Nardozza
authors: Antonio Fernandes
authors: AF
authors: Moron
mesh_terms: D047108:Embryonic Development / Q000502:physiology*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D016216:Ultrasonography, Prenatal / Q000379:methods*