Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right central venous access catheter terminates in the distal SVC . The cardiomediastinal and hilar contours are within normal limits . There is a nodular density at the right lung base . The lungs are otherwise clear . There is no definite pleural effusion or pneumothorax . Visualized osseous structures are grossly intact .
    OUTPUT:
    
Nodular density at the right lung base is concerning for a mass . Correlation with prior imaging is recommended . If unavailable , CT can be performed for further evaluation .