Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A frontal upright view of the chest was obtained portably . The lungs are clear without focal consolidation , pleural effusion or pneumothorax . There is mild bibasilar atelectasis . No free air is seen in the diaphragm . Heart size is normal . Mediastinal silhouette and hilar contours are normal . No acute fracture is identified . Bilateral symmetric 1 .8 cm opacities projecting over the lower lung fields bilaterally are likely nipple shadows .
    OUTPUT:
    
No acute intrathoracic process .