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| __NOTOC__
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| {{Pyloric stenosis}}
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| {{CMG}} {{AE}} {{MMJ}}
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| ==Overview==
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| The pyloric canal is outlined by a string of contrast material coursing through the mucosal interstices, termed the '''[[string sign]]'''; or by several linear tracts of contrast material separated by the intervening [[Mucous membrane|mucosa]]. The latter is termed the '''double-track sign'''. This sign demonstrates the intervening redundant [[Mucous membrane|mucosa]] outlined as a filling defect by the contrast material.
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| [[Fluoroscopy|Fluoroscopic]] observations include vigorous active peristalsis resembling a caterpillar and coming to an abrupt stop at the [[pyloric antrum]], outlining the external thickened [[muscle]] as an extrinsic impression, termed the '''[[shoulder]] sign'''.
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| Luminal [[barium]] may be transiently trapped between the peristaltic wave and the [[muscle]], and this is termed the '''tit sign'''
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| ==Other Imaging Findings==
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| ===Upper GI Series===
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| *The pyloric [[Canal (anatomy)|canal]] is outlined by a string of contrast material coursing through the mucosal interstices, termed the '''string sign'''; or by several linear tracts of contrast material separated by the intervening [[Mucous membrane|mucosa]]. The latter is termed the '''double-track sign'''. This sign demonstrates the intervening redundant [[Mucous membrane|mucosa]] outlined as a filling defect by the contrast material.
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| *[[Upper gastrointestinal series|Upper GI series]] is performed with the infant in the right anterior oblique position, to facilitate gastric emptying.
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| *[[Fluoroscopy|Fluoroscopic]] observations include vigorous active peristalsis resembling a caterpillar and coming to an abrupt stop at the pyloric antrum, outlining the external thickened muscle as an extrinsic impression, termed the '''[[shoulder]] sign'''.
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| *Luminal barium may be transiently trapped between the peristaltic wave and the [[muscle]], and this is termed the '''tit sign'''.
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| *Eventual success of gastric peristaltic activity will propel contrast material through the pyloric mucosal interstices, with the appearance as either the string sign or the double-track sign, although at times more than one layer of contrast material may be appreciated in the mucosal filling [[defect]].
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| (Images courtesy of RadsWiki)
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| <gallery>
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| Image:Hypertrophic-pyloric-stenosis-001.jpg
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| </gallery>
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| ===Nuclear Scanning===
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| Nuclear medicine scanning is not routinely used for hypertrophic pyloric stenosis; however, possible findings include delayed [[gastric]] emptying.
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| ==References==
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| {{Reflist|2}}
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| [[Category:Needs content]]
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| [[Category:Gastroenterology]]
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| [[Category:Surgery]]
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| {{WH}}
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| {{WS}}
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