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abstractA window on life before birth was first opened in the early Eighties with the introduction of ultrasound scanning to the field of obstetrics. The first devices produced very unclear, grainy images. Those who began using them in those days were pioneers in the discovery and interpretation of ultrasound images and their meanings. The technique later evolved, and nowadays we can evaluate fine details such as the crystalline lens, hair or even the urethra. However, even today doctors must taken into account the possibility of error, which must therefore be explained to the mother so that she can make an informed decision.
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