Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest . Heart size and cardiomediastinal contours are normal . Slightly increased right lung base opacity could represent summation of overlapping vascular structures . No focal consolidation , pleural effusion , or pneumothorax . Remote right 9th rib fracture is unchanged .
    OUTPUT:
    
Slightly increased right lung base opacity , possibly representing overlapping vascular structures . PA and lateral views would be helpful , if the patient is able to tolerate .