Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the prior study of ___ , the endotracheal tube , left subclavian line and NG tube have been removed . HD catheter is unchanged in position . Mild pulmonary vascular congestion . There is now a new opacification at the left lung base , which silhouettes the left hemidiaphragm . This is similar in appearance to ___ , but was not seen on the most recent CXR of ___ and likely represents a small effusion with atelectasis , but pneumonia can not be excluded in the appropriate clinical setting . There is no pneumothorax . A surgical suture is noted at the left lung base . Calcified mediastinal lymph nodes are re-demonstrated , better evaluated on the prior CT Chest ___ . Cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
Opacification at left lung base , likely representing an effusion with atelectasis . Pneumonia could be considered in the appropriate clinical setting .