(a) A double-contrast barium meal (DCBM) shows a normally distended antrum (A), duodenal cap (D1) and second part of the duodenum (D2). The pyloric canal, surrounded by the pyloric sphincter, normally measures no more than 10mm in length (arrowheads). RAO position. (b) Normal duodenal cap. The DCBM in erect oblique position shows normal mucosal coating and normal gaseous distension of the first part.
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