Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs demonstrate retrocardiac opacity which corresponds to opacities projecting over the lower lumbar spine on the lateral view worrisome for airspace disease and infectious process . Cardiomediastinal and hilar contours are within normal limits . There is no evidence of pulmonary edema , pleural effusion , or pneumothorax . Eventration of the right hemidiaphragm is noted .
    OUTPUT:
    
Retrocardiac opacity worrisome for a left lower lobe infectious process .