Hilpert P L, Hall B E, Kurtz A B
Department of Radiology, Thomas Jefferson University Hospital, Philadelphia, PA 19107.
AJR Am J Roentgenol. 1995 Mar;164(3):731-4. doi: 10.2214/ajr.164.3.7863903.
Evaluation of the cerebral ventricular system is a routine part of all fetal sonographic examinations. Ventriculomegaly and decreased choroid volume are indicators of poor fetal outcome, so it is important to know the normal variation of these parameters. The present study describes the normal size of the fetal lateral ventricular atrium and the normal amount of choroid plexus within the atrium during the second and third trimesters.
Six hundred eight consecutive, healthy, singleton fetuses from 13 to 42 weeks' menstrual age were examined prospectively. The atrium of the lateral ventricle was measured in the axial and coronal planes. For each axial measurement, the width of the choroid plexus was determined.
An axial atrial measurement was obtained in 88% of the fetuses, and a coronal atrial measurement was obtained in 84%. The mean measurement and one standard deviation are 6.5 +/- 1.5 mm in the axial plane and 6.6 +/- 1.5 mm in the coronal plane. Ninety-eight percent of all measured atria were at least 60% filled by choroid plexus, and in all cases the atria were at least 50% filled. Complete filling by choroid plexus occurred in 58% of cases.
This large prospective study confirms previous observations of mean atrial size. However, four standard deviations above the mean is 12 mm, suggesting currently used cutoffs for normal atrial size are too low. Other parameters, such as choroid plexus filling, may be helpful markers of normalcy in fetuses with atrial measurements between 8 and 12 mm.
评估脑室系统是所有胎儿超声检查的常规部分。脑室扩大和脉络丛体积减小是胎儿预后不良的指标，因此了解这些参数的正常变异很重要。本研究描述了孕中期和孕晚期胎儿侧脑室房的正常大小以及房内脉络丛的正常量。
对608例连续的、健康的、单胎妊娠胎儿进行前瞻性检查，其月经龄为13至42周。在轴位和冠状位平面测量侧脑室房。对于每次轴位测量，确定脉络丛的宽度。
88%的胎儿获得了轴位房测量值，84%的胎儿获得了冠状位房测量值。轴位平面的平均测量值和一个标准差为6.5±1.5mm，冠状位平面为6.6±1.5mm。所有测量的房中有98%至少被脉络丛填充60%，在所有情况下房至少被填充50%。58%的病例脉络丛完全填充。
这项大型前瞻性研究证实了先前关于房平均大小的观察结果。然而，高于平均值四个标准差为12mm，这表明目前使用的正常房大小的临界值过低。其他参数，如脉络丛填充情况，可能是房测量值在8至12mm之间的胎儿正常的有用标志。
