Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided and demonstrate midline sternotomy wires and prosthetic cardiac valve . Multiple mediastinal clips are again noted . There is right perihilar opacity with slight distortion of the fissural surfaces , stable , reflecting known changes from prior radiation treatment . There is no definite sign of pneumonia or overt CHF . Overall , cardiomediastinal silhouette is stable . No pneumothorax . No definite signs of pleural effusion . Bony structures are intact .
    OUTPUT:
    
Stable exam without acute intrathoracic process .