Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal consolidation , effusion , or edema . Chain sutures project over the left lung base . Retrocardiac opacity with undulating contour is compatible with patulous esophagus and fat Bochdalek 's hernia seen on prior CT scan . The cardiomediastinal silhouette is stable . No acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary process .