Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest . Increased interstitial markings are seen particularly at the bases with more confluent density at the left lung base . Overall , given differences in technique from prior chest x-ray there has been no definite interval change . There is no definite effusion . Cardiomediastinal silhouette is stable . Dense atherosclerotic calcifications noted in the aorta . No acute osseous abnormality seen . Degenerative changes seen at the right shoulder . Lower thoracic compression deformity is again noted . Surgical clips identified in the upper abdomen .
    OUTPUT:
    
No definite acute cardiopulmonary process . Findings suggestive of chronic underlying interstiatial lung disease .