Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal and hilar silhouettes are unremarkable . Faint opacity in the periphery of the left lower is likely atelectasis , or may be due to overlying soft tissue . The right lung is clear without focal consolidation . No evidence of pleural effusions or pneumothorax . A circular device is identified overlying the left mid chest , likely related to history of left breast cancer , post mastectomy . Surgical clips in the left axilla are identified .
    OUTPUT:
    
1 . Faint opacity in the periphery of the left lower lung is likely atelectasis . 2 . Post left mastectomy with surgical clips in the left axilla and a circular device overlying the left chest . 3 . The right lung is clear .