Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP radiograph of the chest demonstrates interval esolution of previously seen right lung opacities . There is retrocardiac opacity sihouetting the descending thoracic aorta . Heart size is mildly enlarged . Unfolding of the aorta is noted . Cardiomediastinal contours are otherwise normal . No pleural effusion or pneumothorax . Chronic deformity of the left glenohumeral joint and proximal left humerus .
    OUTPUT:
    
Left lower lobe opacity compatible with pneumonia in the appropriate clinical setting . Post treatment radiograph is recommended for documentation of resolution .