Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes . There is a Hickman catheter over the right lung with the tip in the right atrium . There is patchy opacification at the left base . There is a subcentimeter density projecting over the left eighth posterior rib , which likely represents a calcified granuloma . Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
1 . Subcentimeter density in left lung , likely representing a calcified granuloma from prior TB exposure . 2 . Patchy opacification of left base , which could represent atelectasis , or pneumonia in the appropriate clinical setting .