Normal: The standard plain film of the abdomen is a supine anteroposterior(AP) view; however erect film is taken in certain cases in particular, patients with suspicious of intestinal obstruction to check for air-fluid levels.
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Free intraperitoneal air can be seen on an erect chest radiograph (CXR).
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Rarely, in patients who are unable to sit or stand, a lateral decubitus view (i.e. an AP film with the patient lying on his or her side is performed
Gas pattern: Normal(small and large bowel)
