Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Normal heart size , mediastinal and hilar contours . No focal consolidation , pleural effusion or pneumothorax . Calcification of the aortic knob is unchanged . A 1 .5 cm round density in the right neck is unchanged , possibly reflecting a calcified thyroid nodule . Surgical anchor screws in the right humeral head are stable .
    OUTPUT:
    
No evidence of pneumonia .