Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is opacification of the left lower lobe consistent with atelectasis and less likely infection . There is a focal opacity in the left mid lung which most likely represents loculated fluid along the major fissure . Mild cardiomegaly is identified and unchanged from the prior study . There is no pulmonary vascular redistribution , edema or pleural effusion seen . There is no pneumothorax .
    OUTPUT:
    
Left lower lobe atelectasis and a focal opacity in the left mid lung which most likely represents loculated fluid in the major fissure .