Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single supine AP radiograph through the chest demonstrates stable cardiomediastinal and hilar contours . Patchy nodular opacities within the left upper lobe are identified concerning for an infectious process . There is no large pleural effusions of the left costophrenic angle is incompletely image . There is a right - sided dialysis catheter its tip terminating at the cavoatrial junction in unchanged position . Osseous structures are without an acute abnormality .
    OUTPUT:
    
Nodular opacities in the left upper lobe are concerning for infectious process .