Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph provided . Lungs appear essentially clear . There is minimal linear opacity abutting the left heart border likely representing plate - like atelectasis . There is no effusion or pneumothorax seen . Cardiomediastinal silhouette appears normal . Bony structures are intact .
    OUTPUT:
    
Minimal linear atelectasis in the left lower lung . Otherwise , unremarkable study .