CAMRT Radiography Practice Exam

In acute abdominal cases, why is the left lateral decubitus position preferred over the right lateral position?

1. Because it offers a better view of the left kidney.

2. Because gas can be seen more clearly under the right hemidiaphragm.

3. Because it allows for visualization of the aorta more easily.

4. Because it avoids superimposing the gastric gas bubble on the right side.

The correct answer is: Because gas can be seen more clearly under the right hemidiaphragm.

In acute abdominal cases, the preferred left lateral decubitus position is beneficial primarily because it provides a clearer view of potential air under the diaphragm, particularly on the right side. This position allows gravity to assist in the separation of air from fluid, which is particularly important in diagnosing conditions like free air or abscesses within the peritoneal cavity. Placing the patient in the left lateral decubitus position allows any free air that might be present in the abdomen to rise to the highest point, which is typically the right hemidiaphragm in this position, making it easier to detect in imaging studies. This increased visibility is crucial for accurate diagnosis in acute abdominal conditions where the presence of free air suggests perforation of a viscous structure. The other options focus on anatomy that does not directly relate to the main reason for the preference of positioning in relation to gas visibility in acute conditions.