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Many times students are confused by the diaphragm in radiographs.
In lateral radiographs, the dorsal aspect of the diaphragm presents two shadows. The more cranial dorsal shadow is provided by the crus of the diaphragm on the “lower” side, which is naturally subjected to a greater forward pressure from the abdominal viscera against the less expanded, because lower, right lung.
In this example from a dog in right lateral recumbency the right crus (which is "lower") is more cranial than the left crus and blends with the caudal vena cava. The right and left crura are usually parallel.
Compare the image series to the right lateral radiograph above. Tap the radiograph above to toggle shading.