Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP portable view of the chest demonstrates a left - sided pleural effusion , unchanged in size since ___ . No focal consolidations are present . There is minimally increased pulmonary vascular congestion . There is no evidence of pneumothorax . Cardiac and mediastinal silhouettes are grossly stable .
    OUTPUT:
    
Left pleural effusion , unchanged in size since the prior study .