Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal view of the chest demonstrates low lung volumes . The mediastinal , pleural and pulmonary structures are unchanged . There is no consolidation , pneumothorax or definite pleural effusion . Again noted is interposition of the colon between the right hemidiaphragm and liver .
    OUTPUT:
    
No acute intrathoracic process within the limitations of this study .