Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Midline sternotomy wires again noted . Lung volumes are low . Interstitial opacities are increased from prior which could represent an atypical pneumonia versus interstitial pulmonary edema . Elevated right hemidiaphragm is unchanged . No large effusion or pneumothorax . The heart and mediastinal contours are similar . Mild hilar congestion likely present . Bony structures are intact . Degenerative changes at the AC joints noted .
    OUTPUT:
    
Stable cardiomegaly , likely mild interstitial edema . Difficult to exclude an atypical infection