Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear besides atelectasis at the left lung base . Cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities . No free air below the diaphragm . Excreted contrast seen within the renal pelves bilaterally .
    OUTPUT:
    
No acute cardiopulmonary process .