Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . On the lateral projection one can see the right anterior diaphragmatic pleural contour is elevated and flattened , obliterating the anterior sulcus . This could be due to a small , residual loculation of previously large pleural effusion , or pleural thickening . The left basal pleural surface is normal . Small areas of right costal pleural thickening reflect prior pleural insult . Cardiomediastinum is within normal limits and stable .
    OUTPUT:
    
Small residual right anterior pleural thickening or residual fluid loculation . Followup is warranted only if previous right pleural effusion was malignant or patient has referable signs or symptoms .