2000 年 13 巻 1 号 p. 12-19
The recent advent of high-resolution ultrasound equipment and the introduction of transvaginal sonography have provided further information about normal and abnormal fetal brain structure. The transvaginal approach through the fetal anterior fontanelle has enabled us to visualize both coronal and sagittal sections of the fetal brain, and this has revealed a large number of structural anomalies which can be detected and diagnosed accurately. However, none of the other fetal organs and/or organ systems, including the heart and the abdominal organs, undergo such extensive structural changes, or show such a range of sonographic images during fetal life as the brain. To differentiate normal anatomy from pathology, it is important that we are able to recognize and understand the structural anatomy and embryology of the fetal brain.