Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP chest radiograph demonstrates diffusely increased interstitial markings in a reticulonodular pattern , unchanged from ___ . However there is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
1 . No pneumothorax . 2 . Reticulonodular interstitial opacities , unchanged from ___ and most likely due to atypical infection .