Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left PICC ends in the low mid vena cava . Bilateral lower lobe opacities most likely represent atelectasis . There is no new opacity , pulmonary edema , pleural effusion or pneumothorax . The cardiac and mediastinal contours are normal .
    OUTPUT:
    
No acute intrathoracic process .