Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal semi-erect chest radiograph demonstrates increasing opacity in the left hemithorax . This could be related to increase pleural effusion and associated atelectasis and volume loss , with mild leftward shift of the mediastinum A right pleural effusion is similar . Nodular opacity in the right upper lung and surgical material in the left upper lung are unchanged . There is no pneumothorax .
    OUTPUT:
    
Increasing opacity of the left hemithorax , likely related to a combination of pleural effusion and associated atelectasis and volume loss .