Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: External material overlies the area of sternoclavicular joint debridement . The left PICC line is in unchanged position . There are very low lung volumes . Allowing for lung volumes , as well as a lordotic view , technique and position , no gross discrete pulmonary abnormality is present . No pleural effusion or pneumothorax is present . Low lung volumes , technique and position accentuate heart size .
    OUTPUT:
    
The indication for the study is unclear . External material is seen overlying the sternoclavicular joint debridement site and no gross discrete pulmonary abnormalities are present allowing for very limited exam .