Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . The aorta is slightly tortuous . Mediastinal contours are unremarkable . No focal consolidation or pneumothorax is present . The pulmonary vasculature is normal . Minimal blunting of the left costophrenic sulcus on the frontal view may be due to a trace left pleural effusion or pleural thickening . No acute osseous abnormalities demonstrated .
    OUTPUT:
    
Blunting of the left costophrenic angle on the frontal view may be due to a small pleural effusion or pleural thickening .