Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were compared to previous exam from ___ . When compared to prior exam , there has been interval improved aeration of the left upper lung . Left perihilar mass compatible with patient 's history of recurrent small cell carcinoma is again seen . Persistent elevation of the left hemidiaphragm . Right lung remains clear of focal consolidation . There is no right - sided pleural effusion . There is , however , probable small left pleural effusion . Cardiomediastinal silhouette is otherwise unchanged . Osseous and soft tissue structures are unremarkable . Dual - lead pacing device again seen .
    OUTPUT:
    
Interval improved aeration of the left upper lobe compared to previous exam from two weeks ago . Otherwise , no acute change , noting left hilar mass compatible with patient 's known history of recurrent lung cancer .