Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate a rounded left perihilar opacity , which is new since the prior study , and is suspicious for pneumonia in the appropriate clinical setting . However , since it is round and mass - like , a mass lesion is not excluded . Otherwise , the lungs are clear with no pleural effusion , pulmonary edema , pneumothorax . The cardiomediastinal silhouette is otherwise normal .
    OUTPUT:
    
Left perihilar opacity is unusual but could be seen with round pneumonia in the appropriate setting ; however , short - term follow - up radiographs are recommended within four weeks to ensure resolution and exclude a mass lesion . The above findings were communicated to Dr . ___ by Dr . ___ ___ telephone at 8 :29 p .m . , five minutes after discovery .