Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to the prior exam , lung volumes are lower . There are increased interstitial markings which could indicate a degree of superimposed edema over known pulmonary fibrosis but the appearance is not specific . More patchy opacification at the left base could represent developing infection . Known right upper lobe pulmonary nodules are better seen by CT . No significant pleural effusion is seen . No pneumothorax is present . The heart size is within normal limits . There is tortuosity of the aorta . The patient is status post median sternotomy and CABG . A ventriculoperitoneal shunt is partially imaged with the shunt coursing along the right neck and coursing to the right and appears to terminate in the upper chest . This is similar to the immediate prior examination ; however , on the examination of ___ , the shunt continued along the midline anterior to chest and entered the abdomen . Degenerative changes with apparent resorption of the left distal clavicle and widening of the acromioclavicular interval appear similar .
    OUTPUT:
    
1 . Patchy opacity at the left base concerning for developing infection . 2 . A ventriculoperitoneal shunt appears to terminate in the upper chest and is no longer continuous to the abdomen . Per report , this is related to recent bowel surgery . 3 . Prominent interstitial markings could represent superimposed edema or exacerbation over known pulmonary fibrosis . 4 . Known pulmonary nodules with possible increased nodularity on the left , better assessed by prior PET - CT of ___ . Given the multiple superimposed findings , if there is concern for disease progression , CT may be helpful if clinically indicated , since the status of nodules is not well assessed by radiography .