Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A pacemaker device appears unchanged . The cardiac , mediastinal and hilar contours appear unchanged . There is no definite pleural effusion or pneumothorax . There is patchy left basilar density , as seen previously . but possibly due to normal bronchovascular structures or minor atelectasis . Pneumonia is doubtful .
    OUTPUT:
    
No definite acute cardiopulmonary disease . If pulmonary symptoms are present and were to persist , or if there were to continue to be an unexplained potential source for fever , radiographs could be considered with standard PA and lateral technique .