Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle patchy lateral left lower lobe opacities most likely represent vascular structures , similar in appearance as compared to the prior study . No definite new focal consolidation is seen . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are stable . Old appearing left - sided rib fractures involving at least the left fifth , sixth , and seventh posterior lateral ribs appear new since the prior study , but otherwise appear old .
    OUTPUT:
    
No acute cardiopulmonary process . Old appearing left - sided rib fractures .