Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A frontal upright view of the chest was obtained portably . There is no focal consolidation , pleural effusion or pneumothorax . Minimal linear atelectasis is seen at the left lung base . Heart size is normal . Mediastinal silhouette and hilar contours are normal allowing for technique .
    OUTPUT:
    
No acute intrathoracic process .