Detection of a rocker-bottom foot on ultrasonography is suggestive of which chromosomal abnormality?

Name: Detection of a rocker-bottom foot on ultrasonography is suggestive of which chromosomal abnormality?
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A rocker-bottom foot is a convex sole resulting from a prominent calcaneus and metatarsal heads. It is associated with Trisomy 18, also known as Edwards Syndrome, a chromosomal abnormality leading to developmental delay, growth retardation, and a high rate of miscarriages.

Detection of a Rocker-Bottom Foot on Ultrasonography Is Suggestive of Which