Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . There is upper lobe lucency and splaying of bronchovasculature with widened AP diameter and flattened diaphragms suggesting underlying emphysema . There is a subtle retrocardiac opacity which in the correct clinical setting may represent an early pneumonia . The previously noted opacity in the left lower lung thought to represent a nipple shadow is again subtly visualized . There is no large pleural effusion or pneumothorax . The cardiomediastinal silhouette appears stable . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Possible early pneumonia in the left lower lobe . Emphysema . Subtle opacity in the left lung base which has been previously described on multiple chest radiographs for which dedicated chest CT is recommended on a non-emergent basis to exclude underlying mass .