Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again visualized is a faint opacity overlying the left lower lung either representing scarring or atelectasis . Otherwise , the lungs are clear with no evidence of a consolidation , effusion , or pneumothorax . Cardiac and mediastinal silhouettes remain stable in comparison to the recent study . However , on comparison to the prior study from ___ there is an increased opacity in the region of the arotopulmonary window which may represent lymphadenopathy , aneurysmal formation , or other etiology . There is also left - ward shift of the upper trachea , which appears relatively chronic . No acute fractures are identified . Left - sided port is noted with the catheter tip in the region of the proximal right atrium .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Cardiac and mediastinal silhouettes remain stable in comparison to the recent study . However , on comparison to the prior study from ___ there is an increased opacity in the region of the aroto-pulmonary window which may represent lymphadenopathy , aneurysmal formation , or other etiology . There is also left - ward shift of the upper trachea , which appears relatively chronic . A dedicated Chest CT may be obtained for further characterization .