Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . There is mild perihilar vascular congestion . Subtle opacities in the lung bases bilaterally could be secondary to mild pulmonary edema , however an acute infectious process can not be excluded .
    OUTPUT:
    
1 . Mild perihilar vascular congestion with opacities at the lung bases which could be secondary to mild pulmonary edema , however an acute infectious process can not be excluded . 2 . Nodular opacity at the right lateral lung base could be secondary to a lung nodule . Once the patient 's clinical condition improves , a dedicated PA and lateral chest radiograph would be recommended for further evaluation .