Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Prominence of the central pulmonary vasculature suggests central vascular engorgement . Left base opacity is seen which may be due to atelectasis and overlap of structures , however consolidation due to pneumonia is difficult to exclude . No large pleural effusion or pneumothorax is seen . The cardiac silhouette is top - normal . Mediastinal contours are grossly unremarkable . Degenerative changes seen at the acromioclavicular joint .
    OUTPUT:
    
Retrocardiac opacity could be due to overlapping structures , however , consolidation due to pneumonia is not excluded . Central pulmonary vascular engorgement .