Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart appears mildly enlarged . The mediastinal and hilar contours appear unchanged , including a somewhat convex appearance of the right upper mediastinum , which is most often associated with tortuosity of great vessels . However , it does appear somewhat more prominent than prior examination , although this may be partly due to technique . There is a new left basilar opacity obscuring the medial left hemidiaphragm . This is potentially a small focus of bronchopneumonia , but streaky morphology on the lateral view could be seen with atelectasis . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
New left basilar opacity , pneumonia versus atelectasis . More prominent apparent contour to the right upper mediastinum , probably an artifact of AP technique . However , when clinically appropriate , repeat PA and lateral radiographs are suggested , perhaps as follow - up to a vague small left lower lobe opacity within eight weeks , to reassess .