Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The mediastinal structures appear unremarkable . There is no cardiomegaly . The visualized lung fields are clear without evidence of focal consolidation . There has been interval development of a small / minimal left - sided pleural effusion . No evidence of pneumothorax .
    OUTPUT:
    
Interval development of small / minimal left - sided pleural effusion . Otherwise no evidence of acute cardiopulmonary process .