Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size remains borderline enlarged . The mediastinal and hilar contours are unremarkable . Streaky linear opacities are present within the lung bases , new compared to the previous exam . No pleural effusion , pulmonary edema , or pneumothorax is seen . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
Streaky linear opacities in the lung bases most likely reflective of atelectasis .