Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly low , may be secondary to lack of full inspiration . No focal consolidation , pleural effusion , pneumothorax , or pulmonary edema . Left infrahilar atelectasis is mild . The heart size is normal . Mediastinal and hilar contours and pleura are normal .
    OUTPUT:
    
No acute intrathoracic process . No pneumonia .