Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and aortic valve replacement . Mild cardiomegaly is unchanged . The aorta remains diffusely calcified and tortuous . Pulmonary vasculature is not engorged . Patchy ill - defined opacities are seen within the left upper lung field and left lung base concerning for infection . The right lung is grossly clear . There is no pleural effusion or pneumothorax present . There are mild diffuse degenerative changes of the thoracic spine .
    OUTPUT:
    
Patchy ill - defined opacities in the left upper lung field and left lung base concerning for infection .