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The observation of a mass that is visible on a right lateral radiograph but not on a left lateral radiograph suggests that the mass is likely located within the right lung. In radiographic interpretation, the position and visibility of structures can vary depending on the orientation of the animal and the specific radiographic projections.

When a right lateral radiograph is taken, the right lung will be closer to the image receptor, which can enhance the visibility of any mass present in that lung due to its spatial relationship with surrounding tissues and the effect of superimposition. Conversely, a mass in the left lung may not be apparent on the right lateral view because it is obscured by the heart and other structures that lie between the left lung and the imaging plate. Therefore, if the mass appears in the right view and not in the left, it indicates that the mass is likely situated in the right lung rather than in the body wall, mediastinum, or left lung.

The other options, such as the body wall and mediastinum, would typically show on both lateral views due to their positions relative to the thoracic cavity. A mass in the left lung would also likely be seen in the right lateral view unless it was very small or located in a position where