Fig. 4From: The application of prenatal ultrasound in the diagnosis of congenital duodenal obstructiona The duodenum shows a ‘wind bag’ shape from the transverse of upper abdominal. b The end of the ‘wind bag’ sign shows a ‘rat tail’ sign from transverse of upper abdominal and fetal oblique coronal. Duodenum (D); Stomach (ST); Pylorus(P)Back to article page