Imaging Antenatal Antenatal ultrasonography allows for earlier detection and diagnosis of<unk> . The duodenum is not typically filled with fluid on imaging, however if fluid is visualized on ultrasound, this may suggest<unk>  as it causes obstruction and fluid may not pass distal to the atretic area. Early diagnosis of<unk>  provides time for clinicians to provide prenatal counseling and prepare for postnatal management. Postnatal The diagnosis of<unk>  is usually confirmed by radiography. An X-ray of the abdomen is the first step in evaluation. The x-ray should be obtained after placement of a nasogastric tube (feeding tube), evacuating the stomach and filling 40-50 ml of air to demonstrate two large air filled spaces, the so-called "double bubble" sign. The air is trapped in the stomach and proximal duodenum, which are separated by the pyloric sphincter, creating the appearance of two bubbles visible on x-ray. Since the closure of the duodenum is complete in<unk> , no air is seen in the distal duodenum. Note that the double bubble sign is typically pathologic however it is not specific for<unk>  and may indicate other pathologies such as annular pancreas or midgut volvulus. A limited upper gastrointestinal series using barium contrast can be used to differentiate between<unk>  and midgut volvulus.
Duodenal atresia
Annular pancreas
Intestinal atresia
Gastric atresia
Choanal atresia
Familial multiple intestinal atresia
Gastroschisis
Situs inversus