Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views the chest were provided . Mild scarring at the left lung base is noted . Otherwise the lungs are clear . No convincing signs of pneumonia edema , large effusion or pneumothorax . Cardiomediastinal silhouette appears within normal limits . No acute fracture is seen .
    OUTPUT:
    
Left basal scarring . Otherwise unremarkable . Please refer to subsequent CTA of the chest for further details .