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The most frequent cause of partial obstruction at the duodenojejunal angle is the mesocolic band, described by W. J. Mayo in 1908. Until that time the vicious circle following gastro-enterostomy was the terror of all operators. Since Mayo published his description of this band and advocated its separation before gastro-enterostomy is performed, the vicious circle after gastro-enterostomy has been rarely seen. However, he seemed to attach no importance to the presence of this band as the cause of duodenal ulcer.
My attention was drawn to its presence as a cause of duodenal ulcer in 1910. After separation of the band that extended down for 5% or 6 inches below the duodenojejunal flexure, the contents of the stomach and duodenum were seen immediately to pass down into the jejunum. The patient appeared to be dying on the table, and the abdomen was closed without the performance of a gastro-enterostomy, although the
SLOAN EP. PARTIAL OBSTRUCTION AT DUODENOJEJUNAL JUNCTION AS CAUSE OF ULCER OF DUODENUM. JAMA. 1923;80(14):977–978. doi:10.1001/jama.1923.02640410007003
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