Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle opacity at the left upper to mid lung , projecting over the anterior left better in rib is slightly less conspicuous as compared to the prior study ; findings may represent overlap of structures , however an underlying pulmonary nodule is not excluded . No focal consolidation is seen elsewhere . There is no pleural effusion or pneumothorax . Cardiac and mediastinal silhouettes are stable and unremarkable .
    OUTPUT:
    
Subtle opacity projecting over the anterior left third rib , may represent overlap of structures but a pulmonary nodule or a tiny consolidation not excluded . Recommend shallow obliques or nonemergent chest CT for further assessment .