Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . Vascular stent is noted within the SVC in unchanged position . Pulmonary vasculature is normal . Patchy opacities in the left upper and lower lung fields are nonspecific and may reflect areas of infection . No pleural effusion or pneumothorax is present . No acute osseous abnormalities present . Moderate degenerative changes are noted in the lower thoracic spine . Bone island in the right seventh rib posteriorly is unchanged .
    OUTPUT:
    
Focal patchy opacities in the left upper and lower lung fields may reflect areas of atelectasis though infection is not completely excluded .