ultrasound marker

ultrasound marker
the appearance, on ultrasound examination of a pregnant woman, of a particular physical abnormality in the fetus at a specific stage in fetal development. Such markers suggest the presence of specific chromosomal or developmental abnormalities. For example, the nuchal marker - a dark area in the neck region of the fetus - is one of the markers for Down's syndrome (see nuchal thickness scanning).

Medical dictionary. 2011.

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