Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is borderline enlarged with a left ventricular predominance , unchanged . The aorta is mildly tortuous . Hilar contours are unremarkable , and there is no pulmonary edema . Bibasilar patchy airspace opacities appear slightly progressed in the interval , which could reflect a combination of patient 's known chronic interstitial lung disease with superimposed atelectasis , but progression of the patient 's known chronic interstitial lung disease can not be excluded . There may be a small left pleural effusion . No pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes . Worsening bibasilar parenchymal opacities could reflect progression of the patient 's known chronic interstitial lung disease versus superimposed atelectasis . Infection or aspiration is not completely excluded . Possible small left pleural effusion .