Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No previous images . Low lung volumes may account for much of the prominence of the transverse diameter of the heart . Blunting of both costophrenic angles is consistent with effusion and basilar atelectasis . Dual - channel pacemaker device is in good position . Some indistinctness of pulmonary vessels raises the possibility of elevated pulmonary venous pressure .
    OUTPUT:
    
No evidence of pneumothorax .