Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bilateral lower lobe opacities most likely represent atelectasis . The lungs are clear without focal opacity , pulmonary edema , pleural effusion or pneumothorax . Mild cardiomegaly is stable . There is no free air beneath the right hemidiaphragm .
    OUTPUT:
    
Bilateral lower lobe opacities most likely represent atelectasis .