The earliest congenital anomaly identified by ultrasound is:: (A) Hydrocephalus, (B) Encephalocele, (C) Spina bifida, (D) Anencephaly
Answer is D. Ans. (d) AnencephalyRef.: Nelson 18th ed./Ch. 592.6* Anencephaly is absence of cranial vault posteriorly with brain and meninges exposed.This condition can be detected by antenatal USG as early as 11-12 weeks.