Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright portable chest radiograph obtained . The lungs are clear . No focal consolidation , effusion , or pneumothorax . No signs of CHF . A nodular opacity projects in the left mid lung overlapping with the left posterior seventh rib arch , not clearly seen on the prior exam . Aside from this , no definite nodules are seen . Heart and mediastinal contours are normal . Bony structures are intact . Degenerative changes at the right AC joint noted with hypertrophic changes .
    OUTPUT:
    
Apparent nodule in the left mid lung , new from prior exam warrants a non-emergent chest CT . Otherwise , unremarkable .