Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the recent priors , an approximately 5 cm left pleural mass in the left mid hemithorax is stable in size . The previously seen left pleural effusion is not well appreciated on the current examination . Residual abnormality on the frontal view may represent pleural thickening . Lung volumes are low . The cardiomediastinal silhouette is stable and unremarkable . The pulmonary vasculature is normal .
    OUTPUT:
    
Resolution of left sided pleural effusion .