Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Underpenetration associated with soft tissue attenuation limits assessment . The patient is status post sternotomy . The cardiac , mediastinal and hilar contours appear unchanged . The heart size is difficult to assess due to a suspected cardiac fat pad , which also obscures the left lung base . Mitral annular calcifications are prominent . It does appear , however , that in the right lower lung there is increased opacity while streaky right mid lung opacities have resolved . It is difficult to exclude small pleural effusions . There is probably mild fluid overload but this may be at baseline .
    OUTPUT:
    
Patchy right basilar opacity ; pneumonia or atelectasis could be considered for this appearance . Mild interstitial abnormality , probably mild vascular congestion , although other etiologies including airway inflammation and atypical infection could be considered .