Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright chest radiograph demonstrates clear , well - expanded lungs . The film is slightly rotated , though accounting for this , the heart and mediastinal contours appear normal . There is no effusion , pneumothorax , or focal consolidation . The pulmonary vasculature is normal .
    OUTPUT:
    
No acute chest abnormality .