Ultrasonographic Findings of the Penguin's Beak Sign in Neonates With Anorectal Malformation

In the ultrasound for anorectal malformation, penguin's head represents distal rectal pouch, and its beak runs toward distal side of fistula. Despite the rarity of this disease and insufficient ultrasound experience of the examiner, this sign is useful for ultrasound examiners to accurately diagnose the type of anorectal malformation.