Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . There are peripheral thickened interlobular septa , particularly in the right costophrenic sulcus ( ___ B - lines ) and fissures are mildly thickened . There is a trace pleural effusion on the right side only .
    OUTPUT:
    
Findings suggests mild vascular congestion ; less likely etiology could be atypical infectious process .