Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The previously described left upper lobe mass is not seen on this radiograph . Linear opacities in the left upper lobe can be and a sequelae of prior treatment lung carcinoma . No pulmonary edema , pleural effusion or pneumothorax . The cardiomediastinal contours are unchanged .
    OUTPUT:
    
Left upper lobe linear opacities at site of prior treatment for lung carcinoma .