Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate low lung volumes , accentuating perihilar vascular congestion and crowding . The heart is normal in size . Post - CABG changes and median sternotomy wires are present . The thoracic aorta is tortuous with arch calcifications . Retrocardiac opacity likely represents atelectasis . There is no large pleural effusion or pneumothorax . Thoracic kyphosis is unchanged . Right shoulder severe deformity is chronic . Pronounced left shoulder osteoarthritis is present .
    OUTPUT:
    
1 . Findings suggesting mild perihilar vascular congestion . 2 . Left basilar opacity likely reflecting atelectasis ; however , if there is persistent evidence of or concern for infection based on clinical grounds , then short - term follow - up radiographs could be considered .