Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . There are increased interstitial markings in the lungs , particularly superiorly , which could be due to chronic underlying parenchymal disease . There is no confluent consolidation nor effusion or pneumothorax . The cardiac silhouette is at upper limits of normal . Descending thoracic aorta is tortuous . No acute osseous abnormality is identified .
    OUTPUT:
    
No definite acute cardiopulmonary process .