Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of a left pectoral pacemaker with a single ventricular lead terminating in appropriate position in the right ventricle . Mild cardiomegaly , mediastinal silhouette and hilar contours are unchanged from ___ . Lung volumes are low with associated bibasilar atelectasis . There is no pleural effusion or pneumothorax . Significant dilatation of the colon is incompletely imaged and may be representative of ileus .
    OUTPUT:
    
1 . Appropriate positioning of left pectoral pacemaker with lead terminating in right ventricle without complication . 2 . Dilatation of the colon is incompletely imaged and may be suggestive of ileus or other obstructive process . Results were discussed over the telephone with Dr . ___ by ___ at 11 :42 on ___ at time of initial review .