What position is preferred for demonstrating a fracture along the axillary border of the right 7th rib?

The preferred position for demonstrating a fracture along the axillary border of the right 7th rib is the right posterior oblique taken on full inspiration. In this position, the right side of the body is rotated backwards (posteriorly), allowing the axillary border of the right 7th rib to project away from the mediastinum and other structures, which helps to better visualize the rib in question.

Taking the image on full inspiration is also crucial because it expands the lungs and moves the diaphragm downward, which lowers the soft tissue structures and enhances the visibility of the rib. This positioning minimizes the superimposition of surrounding anatomy, facilitating a clearer view of the fracture line.

Other positions, such as the left lateral position or supine position, would not adequately demonstrate the right 7th rib, as they might obscure the area of interest or involve unwanted superimposition. The right lateral decubitus position, while it may allow for some visualization, does not provide the optimal angle or superimposition reduction needed for clear imaging of the axillary border fracture.