Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with most recent radiograph , previous peripheral ground glass opacity in the periphery of the right lower lung has been replaced by linear atelectasis , commonly seen with pulmonary embolus , less so with infection . Prominence of the right hilum is not significantly changed from prior . Cardiac size is top normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Possible acute pulmonary embolus . Dr ___ paged 8 :35 AM .