Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest were obtained . Allowing for differences in technique and lung volumes , cardiomediastinal silhouette including cardiomegaly is stable . Lung volumes have slightly increased . Mild pulmonary edema and small right pleural effusion is unchanged compared to the prior study . Retrocardiac opacity projecting over the lower spine on the lateral radiograph may represent atelectasis or small focus of developing pneumonia . Lungs are otherwise clear . There is no pneumothorax . The sternotomy wires appear stable . Bones are diffusely osteopenic . Scoliosis is noted .
    OUTPUT:
    
1 . Ill - defined area of opacification projecting over the lower thoracic spine on the lateral view may represent atelectasis or developing pneumonia and clinical correlation is advised . 2 . Cardiomegaly , mild pulmonary edema and small right pleural effusion are unchanged compared to the prior study .