Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP portable view of the chest was compared to previous exam from ___ . Based on a limited portable exam , the lungs are grossly clear of large confluent consolidation or effusion . Cardiomediastinal silhouette is stable . Radiopaque linear structure seen projecting over the left upper quadrant is compatible with a vagal nerve stimulator . Surgical clips seen in the right upper quadrant .
    OUTPUT:
    
Unremarkable limited portable chest x-ray .