Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiographs of the chest were acquired . A left perihilar opacity , consistent with known lung carcinoma as seen on prior PET - CT from ___ , is decreased in size compared to prior chest radiograph from ___ . A 5 - mm round opacity superior to the left hilus is likely a vessel on end , although a small pulmonary nodule can not be completely excluded . The lungs are otherwise clear . The cardiac and mediastinal contours are normal . There are no pleural effusions . No pneumothorax is seen .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Decreased size of left lower lobe pulmonary mass . 5 - mm round opacity superior to the left hilus is likely a vessel on end , although a small pulmonary nodule can not be completely excluded .