Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Cardiomegaly is re - demonstrated with a small left pleural effusion . Associated opacity at the left lung base most likely represents atelectasis versus pneumonia . There is no overt edema . Mediastinal contour is normal . A calcified nodular structure again seen projecting over the right upper lung likely costochondral calcification , as partially seen on a CT C - spine from ___ . No convincing signs of edema . No pneumothorax . Bony structures are stable .
    OUTPUT:
    
Small left pleural effusion with basal opacity likely atelectasis versus pneumonia . Stable cardiomegaly .