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Non-malignant forms of pyloric obstruction are not infrequent and have, I believe, been commonly confused with cancerous disease and, with some exceptions, allowed to die without surgical intervention.
When the stenosis results from the cicatrization of an ulcer which had existed years previously the patient may be in middle life or later before the obstruction becomes marked and the cachexia of chronic starvation closely simulates that of malignant disease.
Now and then cases operated upon by such masters as Senn, Lange, Weir and others have appeared in American literature. European operators have been more advanced in this respect and have furnished many important contributions to the subject.
Stricture of the pylorus following upon the healing of gastric ulcer is the most common form of non-malignant obstruction and four out of five cases upon which I have operated have been of this variety. The site of previous ulceration in these cases
MAYO WJ. CICATRICIAL STENOSIS AND VALVE FORMATION AS A CAUSE OF PYLORIC OBSTRUCTION, WITH A REPORT OF FIVE CASES RELIEVED BY OPERATION.. JAMA. 1897;XXIX(16):778-782. doi:10.1001/jama.1897.02440420012002d