Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bibasilar heterogeneous opacities are increased compared to ___ , most recently ___ . Mild cardiomegaly and pulmonary vascular engorgement are indications of chronic CHF . A large opacity at the base of the left lung , conforming to one of the large convexities in the posterior sulci of both hemithoraces on the lateral view , could be the left component of bilateral pleural effusions , but could also be a lung abscess . If this is clinically suspected , CT scanning should be performed .
    OUTPUT:
    
1 . Consider lung abscess as an alternative to dependent pleural effusion . 2 . Chronic mild CHF .