Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the prior examination , there is a stable fiducial seen in the region of a previously seen lesion in the lower left lung , not clearly delineated on the current exam . There cardiomediastinal silhouette and pulmonary vasculature are unremarkable and stable since the prior examination . There is stable prominence of the right hilum and increased interstitial markings in the right paramediastinal region likely post radiation related . There is no pneumothorax . A small left pleural effusion is noted . No definite consolidation is identified
    OUTPUT:
    
No acute intrathoracic process . Persistent small left pleural effusion and post treatment changes on the right . Fiducial marker in the left lung related to previously noted mass .