Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are stable in appearance compared to previous portable radiograph of ___ when consideration is made for differences in positioning . Pulmonary vascularity is normal , and lungs are clear . Lateral left costophrenic sulcus is not well demonstrated but has similar appearance to previous study .
    OUTPUT:
    
No portable radiographic findings to suggest pneumonia or complications of aortic dissection . However , a portable chest radiograph has a low sensitivityive for diagnosing aortic dissection , and dedicated chest CTA may be considered if there remains clinical suspicion for this entity .