Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP radiograph of the chest demonstrates mild cardiomegaly with mild pulmonary vascular congestion , unchanged from ___ . Patchy opacification of the left lung base may represent atelectasis with a small left pleural effusion , the latter of which appears unchanged . There is plate - like atelectasis in the right lung base . Cervical spine fusion hardware is again noted .
    OUTPUT:
    
Opacification of the left lung base likely represents an area of atelectasis with small left pleural effusion . Unchanged pulmonary vascular congestion and mild cardiomegaly .