Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a subtle heterogeneous opacity at the right lung base which partially obscures the right hemidiaphragmatic contour . On lateral view , the costophrenic angles appear blunted . The lungs are otherwise clear . The heart is stably mildly enlarged . There is no pneumothorax . There is a possible small pleural effusion . Pulmonary vascularity is normal .
    OUTPUT:
    
1 . Subtle opacity at the right base may represent pneumonia in the appropriate clinical setting . Recommend follow - up to resolution . 2 . Possible small pleural effusion . 3 . Stable mild cardiomegaly . No evidence of congestive heart failure .