Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right - sided PICC terminates at the cavoatrial junction as before . Lung volumes are markedly low which accentuates bronchovascular markings . A small left pleural effusion persists and is not significantly increased in size from the prior examination . A left retrocardiac opacity is again demonstrated in could represent an area of atelectasis or consolidation . Additional opacity involving the left upper lobe could represent another foci of infection . The cardiac silhouette is stable from the prior exam . There is mild pulmonary vascular congestion .
    OUTPUT:
    
Persistent retrocardiac opacity is again seen and could represent atelectasis or persistent infection . Left upper lobe opacity could represent another foci of consolidation . A left pleural effusion is stable . Mild congestion .