Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright view of the chest was provided . Lung volumes are low . There are bilateral reticular opacities noted which could represent an atypical pneumonia . No large effusion . No pneumothorax . Cardiomediastinal silhouette appears within normal limits . No free air is seen below the right hemidiaphragm . Bony structures are intact .
    OUTPUT:
    
Diffuse reticular opacities which could reflect an atypical pneumonia . Please refer to subsequent CT of the chest for further details .