Fluoroscopic upper gastrointestinal series in an infant with hypertrophic pyloric stenosis

Images from a barium contrast upper gastrointestinal series demonstrate a dilated stomach (asterisk) with:

(A) The "string sign" showing an elongated and narrowed pyloric canal (arrow).

(B) The "beak" sign (arrowhead), with contrast pointing toward the narrowed canal with impressions from the enlarged pyloric muscle.

Courtesy of Scott R Dorfman, MD.

Graphic 139673 Version 1.0

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