Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . An ___ x 12 mm nodule is demonstrated projecting over the left upper lobe . Remainder of the lungs are clear without focal consolidation . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
12 mm pulmonary nodule projecting over the left upper lobe . Further assessment with chest CT is recommended as this could reflect a malignancy .