(a) Double-contrast barium meal (DCBM). The mucosa has been coated with barium, showing a normal rugal pattern, and the areae gastricae are visible. Normal gaseous distension of the lumen with CO2 is apparent. (b) Spiral CT scan with IV contrast enhancement. The stomach has been distended with CO2, using an oral gas-forming agent. The normal gastric wall is shown. This is usually about 3mm in thickness and should not exceed 5mm.
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