Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate clear lungs bilaterally . There has been a resection of the left 5th rib posteriorly . Two clips are identified projecting just superior to the left proximal clavicle . The cardiomediastinal silhouette appears stable when compared to prior examination dated ___ . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No acute intrathoracic findings . Prior left 5th rib posterior resection .