Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Shallow right posterior oblique ( incorrectly labeled as LPO ) view again shows a 12 mm circumscribed nodule projecting over the left lung and sixth rib . The nodule is not seen on the RPO view . Otherwise , lungs are clear . No pleural effusion , pneumothorax or focal airspace consolidation . Heart is normal size .
    OUTPUT:
    
12 mm nodule projecting over the left lung for which further evaluation with a nonemergent chest CT is recommended . As the nodule was not visualized on the RPO view , it is possible that this is located within the chest wall .