Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta remains tortuous . Mediastinal and hilar contours are unchanged , with tortuosity of the thoracic aorta again noted . Diffuse ground - glass opacities with increased interstitial markings are noted bilaterally , predominantly with an upper zone and perihilar distribution . Findings are similar compared to the prior exams . No pleural effusion or pneumothorax is seen , and no new focal consolidation is present . No acute osseous abnormality is present though there are mild degenerative changes throughout the thoracic spine .
    OUTPUT:
    
Similar appearance of diffuse bilateral ground - glass opacities with increased interstitial markings as seen on the previous CT . Findings could relate to hypersensitivity pneumonitis , and clinical correlation is recommended .