Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest are provided . There is plate - like left lower lung atelectasis versus scarring . No signs of pneumonia or CHF . No effusion or pneumothorax . The cardiomediastinal silhouette is stable with mild atherosclerotic calcification noted along the aortic knob . Bony structures are intact . No free air below the right hemidiaphragm . A deformity of the left mid shaft clavicle is noted , likely chronic .
    OUTPUT:
    
No acute intrathoracic process . Probably chronic left mid shaft clavicle fracture , though clinical correlation for focal pain advised .