Outline Embryology, 221 Ventriculomegaly, 222 Neural Tube Defects, 222 Midline Anomalies, 225 Cystic and Cyst-like Abnormalities of the Posterior Fossa, 229 Intrauterine Cerebral Injuries, 231 Microcephaly, 231 Intracranial Cysts and…
Outline Normal Transvaginal Sonographic Findings in the Early First Trimester, 83 Confirmation or Exclusion of Intrauterine Pregnancy When No Yolk Sac or Embryo Is Seen, 84 Ultrasound Demonstrates No Intrauterine…
Outline Fetal Development in the First Trimester, 98 Embryonic Period (Weeks 4-9 Post Conception), 99 Fetal Period (Weeks 9-14), 101 Normal Ultrasound Findings in the First Trimester, 101 Head and…
Outline Genetics and Birth Defects, 25 Developmental Disorders: Causes, Mechanisms, and Patterns, 25 Chromosomal Defects, 27 Abnormalities of Chromosome Number, 27 Trisomy 21, 27 Trisomy 18, 28 Trisomy 13, 28…
Outline Assignment of Gestational Age, 119 First Trimester Dating, 119 Second and Third Trimester Dating, 119 Measurements, 119 Assigning Gestational Age in the Second and Third Trimesters, 121 Fetal Weight…
Outline Safety of Ultrasound Examination, 3 Indications for Obstetric Ultrasound Examination, 4 Who Should Perform the Ultrasound Examination and How Should It Be Performed?, 5 Nonmedical Use of Ultrasonography, 5…
KEY POINTS Print Section Listen Key Points Neurosonography of the fetus and the neonate is an informative and noninvasive as well as inexpensive modality that is of great benefit in…
8.0 INTRODUCTION Print Section Listen DIAGNOSTIC APPROACH TO SUSPECTED SKELETAL DYSPLASIAS The overall incidence of a lethal skeletal dysplasia is 1/10,000. A detailed fetal anatomic survey is required to satisfactorily…
KEY POINTS Print Section Listen KEY POINTS Failure of closure of the neural tube during neurulation results in neural tube defects. Neurulation, both primary and secondary, are completed by approximately…
6.1 ANAL ATRESIA Print Section Listen EPIDEMIOLOGY/GENETICS Definition Anal atresia is the congenital absence of an anal opening. Epidemiology Occurrence is 1 5000 births (M3:F2). Embryology Anal atresia results from…
