Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Diffused increased interstitial markings are most prominent within the left lower lobe , in correlate with subpleural fibrosis on the reference CT abdomen and pelvis examination . Increased lung volumes may explain the apparent improvement in the diffuse interstitial abnormality , or alternatively , that the patient may have been in mild pulmonary edema yesterday . Bilateral hilar enlargement may be secondary to lymphadenopathy or dilated pulmonary arteries . There is no lobar consolidation , pneumothorax , or large pleural effusion . The heart size is top - normal . The thoracic aorta is heavily calcified .
    OUTPUT:
    
1 . Increased interstitial markings , most significant at the left lung base , compatible with fibrotic changes likely secondary to underlying interstitial lung disease . Pulmonary edema improved overnight . 2 . Bilateral hilar prominence , which may be secondary to lymphadenopathy or pulmonary arterial enlargement and hypertension .