Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs . There is no focal consolidation , pleural effusion , or pneumothorax . The cardiomediastinal silhouette is within normal limits . 4 - mm nodular opacity overlying the anterior left 4th rib may be a bone island or a prominent vessel .
    OUTPUT:
    
No acute cardiopulmonary process .