Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph is obtained . Low lung volumes limit the evaluation , though allowing for this , there is no focal consolidation , large effusion , or definite signs of CHF . The heart size is within the range of normal . Mediastinal contour is unremarkable . Bony structures are intact .
    OUTPUT:
    
No acute intrathoracic process .