Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is irregular potentially interstitial opacity along the periphery of the left lateral lung on the frontal view which is not clearly identified on the lateral . There is possible tethering of the left hilum towards the periphery . Additionally , there is a suggestion of prominent extrapleural fat lateral to this opacity . While infection is not excluded , this is an unusual presentation for pneumonia . This could also be a pleural - based scar or peripheral subpleural interstitial fibrosis . The right lung is clear . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
Unusual left lateral peripheral interstitial opacity . This could be pleural - based scarring or other pleural - based abnormality or peripheral interstitial abnormality . While infection is not completely excluded , this is an unusual appearance for a typical pneumonia . Recommend a CT of the chest with contrast for further characterization . Results were emailed to the ED QA nurses on ___ by Dr . ___ , as the patient had been discharged by the time the findings were communicated with the ED resident .