Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An opacity projecting over the right hilum is unchanged from prior examination is consistent with paramediastinal radiation changes . There is a persistent loculated right pleural effusion , unchanged in size from prior . The left lung remains clear . No pneumothorax is evident . There is pulmonary vascular congestion , though no overt pulmonary edema . Cardiac size is within normal limits and unchanged .
    OUTPUT:
    
Stable post-treatment changes related to known small cell lung carcinoma . No superimposed acute cardiopulmonary process .