Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size and cardiomediastinal contours are stable . Status post transcatheter aortic valve replacement . Linear opacities in the left lung base and heterogeneous opacities in the left mid lung are nonspecific but may represent infection in the setting of fever . The right lung is clear . No substantial pleural effusion or pneumothorax .
    OUTPUT:
    
Heterogeneous opacities in the left mid lung may represent atelectasis but infection can not be excluded in the setting of fever .