Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear opacities within the left lung base are similar to prior and likely reflects atelectatic scarring . No superimposed confluent consolidation is identified . Blunting of the bilateral costophrenic angles remains mild and may reflect chronic pleural thickening or small effusions . No pulmonary edema or large pleural effusions are evident . A right upper paramediastinal mass lesion corresponds with patient 's known primary lung carcinoma and is better characterized on recent CT . Known diffuse osseous metastases are not well characterized on this chest radiographic examination . No obvious compression deformity of the thoracic spine is evident , though evaluation is limited due to patient 's arm position . Cervical spinal fusion hardware is partially imaged .
    OUTPUT:
    
1 . Stable appearance of known primary lung cancer and left basilar scarring . No superimposed cardiopulmonary process . 2 . Known diffuse osseous metastases not well evaluated on this radiographic examination .