Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Prior left pleural effusion is no longer seen . Vague opacity projecting over the left lung laterally is compatible with pleural based scarring seen on prior CT . The lungs are clear without focal consolidation . Mild cardiac enlargement is unchanged . Atherosclerotic calcifications are noted at the aortic arch . Old right lateral rib fractures are noted .
    OUTPUT:
    
No acute cardiopulmonary process .