Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Midline sternotomy wires and prosthetic cardiac valve again seen . The lungs are clear . No focal consolidation , effusion or pneumothorax . Minimal basal atelectasis noted on the left . Heart and mediastinal contours appear normal and unchanged . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
No acute intrathoracic process .