Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are unremarkable . There are increased interstitial markings diffusely , with small amount of fluid noted within the fissures . Minimal blunting of the left costophrenic angle on the frontal view is also noted compatible with a trace left pleural effusion . No focal consolidation or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild diffuse interstitial abnormality suggestive of an atypical infectious process with a trace left pleural effusion .