Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . Cardiomegaly is mild . There is a small pleural effusion on the right , similar to prior findings ; no definite one on the left side . Fissures are again thickened and there is suspicion for very mild central hilar congestion .
    OUTPUT:
    
Persistent small right - sided pleural effusion and mild vascular congestion , but no significant change .