Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Right paratracheal opacity without mass effect on the adjacent trachea is stable since at least ___ and may relate to prominent vascular structures . No new focal consolidation is seen . There is no pleural effusion . Rounded left base retrocardiac opacity , seen on the frontal and lateral views is most consistent with hiatal hernia seen on abdomen / pelvis CT from ___ . The cardiac and mediastinal silhouettes are stable with the cardiac silhouette mildly enlarged . Left base atelectasis is seen .
    OUTPUT:
    
No acute cardiopulmonary process .