This chest X ray shows a pleural effusion.

In this PA view, it is demonstrated by a radiopaque shadow at the right lung base with a curvilinear superior border that obliterates the right costophrenic angle. The left lung field is clear. There is a normal cardiac silhouette and heart size, as demonstrated by the normal cardiothoracic ratio.

The pulmonary vascularity, mediastinum and hilar areas are normal.