Hypertrophied muscle ring on the upper (gastric) end of the pylorus.
Vrsansky
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D006801:Humans; D006984:Hypertrophy; D009130:Muscle, Smooth / Q000473:pathology*; D011707:Pyloric Stenosis / Q000209:etiology / Q000473:pathology / Q000601:surgery*; D011708:Pylorus / Q000473:pathology* / Q000601:surgery*; D012086:Reoperation; D014839:Vomiting / Q000209:etiology*