In which condition is this most likely to be seen?: (A) Trisomy 16, (B) Monosomy X, (C) Trisomy 21, (D) Trisomy 13
Answer is C. USG showing Sandal Gap. There is an apparent increase in the inter space between the great toe of the foot from the rest of the toes (likened to the gap caused by a sandal). It is a soft tissue marker of Down's Syndrome.