Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: New irregular 0 .5 cm x 0 .5 cm opacity projecting over the left ___ posterior rib . No additional focal opacity , pleural effusion , pulmonary edema , or pneumothorax . Heart size , mediastinal contour and hila are normal . No bone abnormality .
    OUTPUT:
    
1 . New irregular opacity projecting over the left ___ posterior rib may be artifact , however consider repeat radiograph in 10 days to assess for clearing . 2 . No pneumonia .