Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are compared to previous exam from ___ . Linear opacities at the lung bases suggestive of atelectasis versus scarring , not significantly changed from prior . The lungs superiorly are clear . There is no pleural effusion . Cardiomediastinal silhouette is normal , unchanged from prior . Osseous and soft tissue structures are unremarkable . Surgical clips in the upper abdomen suggest prior cholecystectomy .
    OUTPUT:
    
No definite acute cardiopulmonary process . Linear opacities at the lung bases , most suggestive of atelectasis or scarring . However , clinical correlation is suggested to exclude component of infection .