Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy , and mitral and tricuspid valve replacements . Lung volumes are low . Heart size remains mildly enlarged . Mediastinal and hilar contours are similar . Calcified granuloma is seen within the right upper lobe , along with multiple right hilar calcified lymph nodes compatible with prior granulomatous disease . Crowding of the bronchovascular structures is present , with possible mild pulmonary vascular congestion . Minimal atelectasis is seen in the retrocardiac region without focal consolidation . No pleural effusion or pneumothorax is visualized . Compression deformities of several mid thoracic vertebral bodies appear relatively unchanged with associated kyphosis .
    OUTPUT:
    
Low lung volumes with possible mild pulmonary vascular congestion and retrocardiac atelectasis .