|Print Date:||May 22, 2013, 11:05 am|
|Text||In an AP film of the abdomen, the patient is lying on her/his back (supine position), and all air goes up (anterior). The transverse colon is anterior, so it is visible with air in this position.
In the prone position (PA - stomach down), the rectum, descending and ascending colon become air-filled (if there is air)- because they are more posterior structures and are now higher.
Sometimes a cross-table (horizontal X-ray beam) radiograph may help visualize free air in the abdomen. Images may be obtained supine, prone, or in a lateral (decubitus) position.
|Contributor||James G. Smirniotopoulos, M.D. (Uniformed Services University)|
|Peer Reviewer||James G. Smirniotopoulos, M.D. (Uniformed Services University)|
|Record Number||: 1014|
|Location:||Abdomen - Generalized|
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