Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are stable and unremarkable . Mild blunting of the left costophrenic angle noted , which may represent a trace pleural effusion or scarring . No large pleural effusion is seen . There is no evidence of pneumothorax . Lungs are well - expanded without focal consolidation concerning for pneumonia . A radiopaque rectangular structure is seen overlying the left anterior chest wall , battery pack , or possible cell phone .
    OUTPUT:
    
Slight blunted left costophrenic angle may be due to trace pleural effusion or pleural thickening . No definite focal consolidation .