Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size remains mild to moderately enlarged . The mediastinal contours are stable with calcification of the aortic knob again noted . There is mild pulmonary edema , similar compared to the prior study with peribronchial cuffing noted . Small left pleural effusion persists . No pneumothorax is identified . Degenerative changes of the thoracic spine are noted with unchanged compression deformity of the L1 vertebral body .
    OUTPUT:
    
Mild pulmonary edema and small left pleural effusion , similar compared to the prior exam .