Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lateral view shows a 13 mm nodular opacity projecting over the heart just above the diaphragm , which may explain the slight increase in size of the lingular opacity obscuring the cardiac apex on the frontal view . This would be an unusually small pneumonia , though possible . If it does not resolve in four weeks , it needs to be investigated with a CT scan . There is no pleural effusion or pneumothorax . The heart is mildly enlarged with right atrial enlargement as before with otherwise normal hilar and mediastinal contours .
    OUTPUT:
    
New nodule , could be lung infection . Suggest follow up CXR in 4 weeks .