Malinger G, Zakut H
Department of Obstetrics & Gynecology, Sackler Faculty of Medicine, Tel-Aviv University, Edith Wolfson Medical Center, Holon, Israel.
AJR Am J Roentgenol. 1993 Nov;161(5):1041-3. doi: 10.2214/ajr.161.5.8273605.
Detection of the corpus callosum in the developing fetus on sonograms usually is difficult. We determined the normal appearance and development of this structure during the second half of pregnancy, as shown on transvaginal sonograms.
One hundred one fetuses were evaluated with transvaginal sonography between 18 and 42 weeks' gestation. The length of the corpus callosum and the thicknesses of the genu, body, and splenium were measured, and growth tables were produced.
The corpus callosum was detected in 95% of cases and showed gradual enlargement during pregnancy; growth was linear, from nearly 17 mm in length at 18 weeks' gestation to 44 mm at term. The ratios of the length of the corpus callosum to the anteroposterior diameter of the brain remained relatively constant from 20 to 21 weeks' gestation to term.
Transvaginal sonography can be used to visualize and measure the corpus callosum in the developing fetus. Data from this study may be useful as a reference for normal development of the corpus callosum.
在超声图像上检测发育中胎儿的胼胝体通常很困难。我们确定了妊娠后半期经阴道超声图像上该结构的正常外观和发育情况。
对101例妊娠18至42周的胎儿进行经阴道超声检查。测量胼胝体的长度以及膝部、体部和压部的厚度，并制作生长图表。
95%的病例中检测到胼胝体，且在孕期呈逐渐增大趋势；生长呈线性，妊娠18周时长度近17毫米，足月时达44毫米。从妊娠20至21周直至足月，胼胝体长度与脑前后径的比值保持相对恒定。
经阴道超声可用于观察和测量发育中胎儿的胼胝体。本研究数据可作为胼胝体正常发育的参考。
