Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There is subtle small area of left base opacity which could be due to artifact , although an underlying early consolidation can not be entirely excluded . The right lung is clear . No pleural effusion or pneumothorax . Cardiac and mediastinal silhouettes are unremarkable . No overt pulmonary edema is seen .
    OUTPUT:
    
Small very subtle focus of increased density at the left lung base may be artifactual , but in the appropriate clinical setting , early / mild consolidation can not be excluded . Remainder of the lung fields is clear .