Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal supine view of the chest was obtained . Radiopaque marker of the IABP overlies the inferior aspect of left main bronchus . The heart is of normal size with normal cardiomediastinal contours . Lungs are clear without focal or diffuse abnormality . No pleural effusion or pneumothorax .
    OUTPUT:
    
Radiopaque marker of the IABP overlies the inferior aspect of left main bronchus . Findings were communicated via phone call by ___ to Dr . ___ on ___ at ___ .