Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate a slightly lobulated contour of the left hilus as well as unusual course of the left pulmonary artery . Lungs are clear . Heart size is normal . No pleural effusion or pneumothorax identified . No osseous abnormality is evident .
    OUTPUT:
    
Unusual configuration of the left hilus and pulmonary artery . Recommend evaluation with contrast enhanced chest CT .