Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable semi-upright chest radiographdemonstrates intact median sternotomy wires . Lung volumes are low with crowding of vasculature . There is moderate pulmonary edema with cephalization of vasculature . Mild increase in left base opacity is noted . Small bilateral , left greater than right , pleural effusions have slightly increased in size since previous examination . No pneumothorax . Mild cardiomegaly is likely accentuated due to low lung volumes and patient positioning . Mediastinal contour and hila are otherwise unremarkable . Limited assessment of the upper abdomen is within normal limits . Posterior fusion device of thoracic spine is again seen .
    OUTPUT:
    
1 . Mild increase in left lower lobe opacity is worrisome for pneumonia , although differential includes asymmetric pulmonary edema and atelectasis . Clinical correlation is recommended . 2 . Interval increase in moderate pulmonary edema with small bilateral , left greater than right , pleural effusions .