Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left PICC is in place with the tip terminating at the cavoatrial junction . The lungs are symmetrically well expanded and well aerated . There is an ill - defined airspace opacity projecting over the left mid lung zone , which is decreased from the prior study . The left lung base is better aerated . No pleural effusion or pneumothorax is present . Biapical scarring appears symmetrical . There is no overt pulmonary edema . The cardiomediastinal and hilar contours are within normal limits . There is no free air beneath the right hemidiaphragm .
    OUTPUT:
    
1 . Focal airspace opacity in the right mid lung most likely represents residual / resolving infection . 2 . No evidence of free air .