Hill L M, Thomas M L, Kislak S, Runco C J
University of Pittsburgh Health Center, Magee-Women's Hospital, Department of Ultrasound, Pennsylvania.
Am J Perinatol. 1988 Jan;5(1):13-5. doi: 10.1055/s-2007-999643.
Ultrasound has the potential for diagnosing fetal abnormalities in utero with a high degree of accuracy. During the first trimester, peculiarities of fetal development may suggest to the novice sonographer an abnormality where one does not exist. Similarly, particular anatomic structures may appear normal in the first trimester, yet evolve into an obvious abnormality later in gestation. For these reasons, the ultrasonic diagnosis or exclusion of a congenital anomaly in the first trimester should be made only with caution.
超声有潜力在子宫内高度准确地诊断胎儿异常。在孕早期，胎儿发育的特殊性可能会让新手超声检查医师误以为存在异常，而实际上并不存在。同样，某些特定的解剖结构在孕早期可能看起来正常，但在妊娠后期却会演变成明显的异常。基于这些原因，孕早期超声诊断或排除先天性异常时应谨慎行事。
