Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded . Streaky atelectasis at the left base which was seen on prior CT of the chest is redemonstrated . Prior small bilateral pleural effusions are not well appreciated . There is no new focal airspace opacity . Moderate - to - large hiatal hernia projects behind the heart . The mediastinal and hilar contours are normal . There is no pneumothorax . Deformity of the right fifth rib is redemonstrated .
    OUTPUT:
    
Persistent linear opacity at the left base without acute cardiopulmonary abnormality .