What is seen earliest in USG?: (A) Yolk sac, (B) Fetal hea, (C) Chorion, (D) Placenta
Answer is A. Yolk sac is the first anatomic structure seen within gestational sac. By TVS, it can be seen as early as 5.5week By TAS, it is seen by 7 weeks. Ref:Datta Obs 9e pg 601.