Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Hyperexpansion , diminutive blood vessels are consistent with severe emphysema . Prominent pulmonary arteries suggest pulmonary hypertension . There is no mass lesion . The cardiomediastinal silhouette is within normal limits . The lungs are clear .
    OUTPUT:
    
No radiographic evidence of intrathoracic malignancy . CT is more sensitive for detecting an underlying mass .