Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate diffuse reticular opacities , overall stable as compared to multiple prior exams allowing for technical differences . Although subtle supervening infection on background pulmonary fibrosis and bronchiectasis is difficult to exclude , there is no confluent consolidation . There is no pneumothorax or large effusion . The heart is top normal in size with multivessel coronary arterial disease . There is atherosclerotic calcification within the aortic arch . A large hiatal hernia is present . Severe left shoulder osteoarthritis is noted .
    OUTPUT:
    
No definite evidence of acute infection . Overall stable background pulmonary fibrosis and traction bronchiectasis . If there is clinical concern for subtle supervening infection , CT could be obtained .