Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is left lower lobe scar present . Lungs and pleural spaces are otherwise clear without pneumothorax or pleural effusions . There are low lung volumes . Heart is slightly enlarged . There is no evidence of pneumoperitoneum . Osseous structures are grossly intact .
    OUTPUT:
    
No acute intrathoracic process .