Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable semi-erect chest radiograph was obtained . Small bilateral pleural effusions have decreased since yesterday . Aeration of the lungs may be slightly improved , but central pulmonary vascular congestion and cephalization remain . The cardiomegaly is unchanged . There is no new consolidation , effusion , or pneumothorax .
    OUTPUT:
    
Slight interval improvement in small bilateral pleural effusions since yesterday .