Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP semi upright and lateral views of the chest provided . Left chest wall AICD is again seen with leads extending to the region of the right atrium , Coronary sinus , and right ventricle as on prior . Midline sternotomy wires and mediastinal clips again noted . Lung volumes are low limiting assessment . There is subtle retrocardiac opacity which could represent a developing pneumonia or aspiration . There is mild right basal atelectasis with mildly elevated right hemidiaphragm . No overt edema . No pneumothorax or definite signs of effusion . Cardiomediastinal silhouette is stable . Chronic right rib cage deformities again noted . No acute fracture is seen .
    OUTPUT:
    
Retrocardiac opacity , question pneumonia versus aspiration . No overt edema .