Fig. 2From: Significance of the ‘line sign’ in the diagnosis of congenital imperforate anus on prenatal ultrasoundThe sonographic demonstration of the anus of the fetus with imperforate anus showed ‘line sign’. The higher the position of the imperforate anus was, the more obvious the ‘line sign’. a High type imperforate anus. b Imperforate anus between high and low position. c Low type imperforate anusBack to article page