Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright view of the chest provided . Lung volumes are somewhat low , though allowing for this , no convincing sign of pneumonia , effusion , or pneumothorax . The heart appears top normal in size , though this appears stable . No evidence of pulmonary edema or congestion . Bony structures are intact .
    OUTPUT:
    
Top normal heart size without signs of pneumonia or CHF .