Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is i bold ncreased opacity projecting over the anterior right 6th rib which is felt to be related to callus formation from prior fracture . There is also a retrocardiac opacity . There is no effusion or overt pulmonary edema . Right apical granuloma again noted . Moderate cardiomegaly and aortic graft repair unchanged . No acute osseous abnormalities detected .
    OUTPUT:
    
Retrocardiac opacity , potentially atelectasis noting infection is not excluded .