Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette and pulmonary vasculature are unremarkable . Calcifications are noted at the aortic knob . There is no pneumothorax or pleural effusion . There is no definite focal consolidation . Minimal linear density in the inferior lingula is mild atelectasis .
    OUTPUT:
    
No acute intrathoracic process .