Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . There is a focal eventration of the left hemidiaphragm , likely accounting for the subtle retrocardiac opacity . A subtle nodular opacity at the right lung base which could represent a nipple shadow , though this is indeterminate . No definite signs of pneumonia or CHF . The heart appears top normal in size . Mediastinal contour is normal . Bony structures appear intact with degenerative anterior spurring in the thoracic spine .
    OUTPUT:
    
Subtle nodular opacity at the right lung base for which non-emergent CT may be performed to further assess .