Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . Mediastinal and hilar contours are unchanged , and the pulmonary vascularity is within normal limits . Right apical scarring is unchanged . 4 mm calcified nodule in the right mid lung field is unchanged , likely a granuloma . Lungs are clear without focal consolidation . Minimal blunting of the costophrenic angle on the right posteriorly may suggest the presence of the trace pleural effusion . No pneumothorax is detected . There are no acute osseous findings .
    OUTPUT:
    
Possible trace right pleural effusion posteriorly . Otherwise , no acute cardiopulmonary abnormality .