Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . The lungs are clear without focal consolidation , effusion , or pulmonary vascular congestion . The cardiomediastinal silhouette is within normal limits . Atherosclerotic calcifications are seen at the aortic arch . Degenerative changes are seen at the shoulders . No acute osseous abnormality is identified . Somewhat rounded opacity projecting behind the heart on the lateral view and overlying the spine is compatible with a right Bochdalek hernia identified on prior CT .
    OUTPUT:
    
No acute cardiopulmonary process .