Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Limited evaluation of PA and lateral radiograph due to body habitus and arm positioning . Streaky opacification in left lower lung likely reflects atelectasis . No pleural effusion or pneumothorax present . Cardiac , hilar , and mediastinal silhouettes are unremarkable . Heart size is top normal .
    OUTPUT:
    
No definite acute intrathoracic process .