In pregnant women of 28 weeks gestation IUD is earliest demonstrated on X-ray by:: (A) Increased flexion, (B) Overlapping of cranial bone, (C) Spalding's sign, (D) Gas in vessels
Answer is D. Gas in the great vessels of fetus is called as Robes sign It occurs 12 hrs interval after death. Ref: Datta Obs 9e pg 303.