Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The study is limited due to exclusion of part of the left hemithorax . There are no focal opacities in the imaged lungs . There is no pleural effusion in the right or pneumothorax . Sternotomy wires are intact and a prosthetic aortic valve is present . Severe degenerative changes of the right shoulder are also noted .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .