Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are clear on the frontal view . On the lateral view heterogeneous radio opacity , 2 cm across , in the middle lobe or lingula , projects over the anterior cardiac silhouette . It s chronicity is indeterminate because there are no prior lateral chest radiographs . It could be a scar , , but it could also be a small pulmonary infarct or in lung nodule . When feasible , repeat radiographs should be obtained at full inspiration if the abnormality persists it should be evaluated with chest CT . No effusion or pneumothorax . Heart is top - normal in size . Mediastinum and hilar contours are normal . No subdiaphragmatic free air is identified .
    OUTPUT:
    
Suggest further evaluation of possible left lung nodule , infarct , or scar .