Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . The lungs are clear without focal consolidation , pleural effusion or pneumothorax . Stable faint linear scarring in the left lung base with mild tenting of the diaphragm is stable from ___ . Heart size is normal . Mediastinal silhouette and hilar contours are normal . There is no free air under the right hemidiaphragm . No acute osseous abnormality is identified .
    OUTPUT:
    
No acute intrathoracic process .