Purpose or Case Report: Hypertrophic pyloric stenosis (HPS) is a common surgical condition in infants characterized by idiopathic thickening of the gastric pyloric musculature that results in progressive gastric outlet obstruction and non-bilious emesis in infants between the ages of 2 weeks and 3 months. Ultrasound is the best imaging modality in the diagnosis of HPS as it allows for clear delineation of the thickened pyloric muscle and elongated pyloric channel, as well shows associated findings including gastric distention and lack of normal gastric emptying. To the untrained eye however, lack of knowledge of normal anatomy complicated by intermittent antral contraction may make it difficult to confidently exclude HPS. Several fun and helpful radiologic signs have been created to help radiologists and especially radiology trainees recognize the ultrasound findings of HPS (e.g. antral nipple sign and cervix sign). This poster discusses a new radiologic sign called the "eating duck sign" that can be helpful in distinguishing the normal gastric pylorus. In this sign, the distal stomach and antrum appear as the body and head of the duck, the normal gastric pylorus appears as the bill of the duck, and the duodenal bulb appears as the turnip or beet shaped snack of the duck.
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