Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP supine view the chest provided . Midline sternotomy wires and mediastinal clips again noted . Cardiomediastinal silhouette is stable . Lungs remain clear . Bony structures are unchanged . No definite fracture is seen . Degenerative changes at both shoulders noted .
    OUTPUT:
    
No acute intrathoracic process .