system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Earliest anomaly to be detected in ultrasound is:
assistant
The correct answer is  Earliest anomaly to be detected in ultrasound is Anencephaly (as early by 10th week) Anencephaly in Ultrasound: Acrania Loosely arranged brain parenchyma Frog Eye Appearance Figure: Frog eye sign and irregularly outlined brain patter protruding freely into amniotic fluid is seen, with absence of cranial vault.