Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac and mediastinal silhouette is unremarkable . There is no pleural effusion or pneumothorax . Minimal opacity is suspected in the right middle lobe to explain a slightly obscured right lateral cardiac border on the frontal view .
    OUTPUT:
    
No convincing evidence for pneumonia ; suspected slight atelectasis in the right middle lobe .